Continuity mistake: Once the chipmunks are inside the food cupboards, they begin to devour everything inside. Theodore is seen chewing off a corner of a box of Lucky Charms cereal and eating the cereal that pours from the hole. But a few shots later when the same box of cereal can be seen, the hole that Theodore gnawed from the corner of the box is gone and the corner is fully intact.
Continuity mistake: When we see Dave making the shoebox house for the chipmunks and writing a letter to them, Dave pokes five messy airholes in the top of the box. However when he decides against the idea and puts the box up on a high shelf, now you can see that in the lid of the box there are now seven airholes and also the holes looks much neater than before.
Continuity mistake: When the chipmunks are giving Dave the presents they got him, Theodore had made him a card out of a folded sheet of paper. On the front of the card he has written (and misspelt) "To Dav" note this handwriting. From when the card is laying on the table to when Dave picks it the writing has changed. When it was on the table the T was crossed and the V was longer than the A. But when Dave picks it up the T is uncrossed and neat and the V is now the same size as the A.
Continuity mistake: After Dave has caught Alvin from off his head and trapped him inside a woollen hat, the removal of the hat causes Dave's hair to get messy and parts of hair have fallen down over his forehead. But in the following shot his hair is neat and brushed back to how it was before.
Continuity mistake: On top of the white cabinets / cupboards that run along the kitchen is a whole row of glass jars, vases, pots, etc. During the whole kitchen scene, the actual jars and pots that are on top of these cabinets move around and rearrange in different shots. In the close-up of Alvin pushing over the packet of Cheese Balls for instance; you can see that the jars and pots on the cupboard above are differently arranged than in other wide shots of the whole kitchen.
Continuity mistake: In the scene inside the house that Uncle Ian gave the chipmunks, Alvin has foam darts on three air-pump launchers. He fires all three of the foam darts from the launchers; and we see him standing on the table with the three launchers and the three attached air-pumps, nothing else. But in the next shot suddenly all three of the launchers have a foam dart readily attached to them! And in addition a large pile of foam darts has appeared on the table, behind Alvin.
Continuity mistake: When Dave leaves his house for work, there is a skateboard leaning up against the wall by the door and there is an umbrella stand with a lot of umbrellas in it. But when Dave gets back home from work the skateboard is now on the other side of the door in the corner and there are now fewer umbrellas in the stand.
Continuity mistake: Towards the beginning when Dave leaves the record label (after he steals the muffins), downstairs you can see a girl in a pink top, a delivery guy and a black guy in beige boots. The girl in the pink top passes Dave, then it cuts and you see her in front of Dave. Then it cuts again and you see her behind Dave and going around a corner. Also, the guy in the boots does the same thing a few times. And the delivery guy comes up close to the shot in the end, then they show him again just getting close.
Continuity mistake: Inside the house that Uncle Ian gave the chipmunks, the chipmunks are all playing with the new toys they have received. Simon and Theodore are on a trampoline and Alvin is playing around with foam darts. In one shot we see four foam darts shoot across the room in succession however there are only three dart launchers.
Continuity mistake: When Dave gets back from Jett Records he enters his music study, removes his jacket and throws it into a blue plastic box. He then takes his keyboard and throws it outside. Then when he comes back into the study we can see the box again, but now his jacket is no longer inside it.
Continuity mistake: When Uncle Ian arrives at Dave's house on Christmas, he comes in with a huge pile of gifts as well as a huge Santa sack full of presents for the chipmunks. When he walks through the door with the sack the door swings to a shut behind him. But in the next shot more people from Jett Records walk through the same door with more gifts only now the door is wide open for them.
Continuity mistake: When Dave hears the chipmunks singing outside on the tree trunk, he goes and opens the window to hear them better. The window to the viewer's right (from outside) has its slatted blinds down and they are also closed. But after the chipmunks finish singing 'Funky Town', the same blinds aforementioned are now open.
Continuity mistake: When Dave comes back home with the food that he has bought he discovers that the chipmunks have completely cleaned his entire house for his date. When he comes inside and stops to look at how clean the living room is, watch the slatted blind on the door behind him. In the first shot the slats are closed, but when Dave walks into the kitchen the slats are open.
Continuity mistake: Alvin pushes over a packet of Cheese Balls and they fall from the cupboard and into a bowl that is on the kitchen counter. He then cannon-balls from the cupboard into the bowl of Cheese Balls which causes a lot of them to fall out of the bowl, spilling all over the counter. However when Dave walks into the kitchen and spots the bowl, the amount of cheese balls on the counter (around the bowl) is much less.
Continuity mistake: When Dave gets back from work and is lying on the couch, on the counter behind him you can see two jars (one with a green lid and the other with a white lid.) But later when Dave notices the bowls moving across the same counter, the glass jar with the white lid has now vanished. Also the magnets and papers on the fridge differ as well.
Visible crew/equipment: When Dave first discovers that the chipmunks can sing, as they perform on the tree stump outside his window for him, after they sing 'Funky Town' there is a shot from outside looking through the window and to the right of Dave (through the window) you can see the long pole of the boom microphone; it is not seen in any other shots.
Continuity mistake: Once Alvin has opened up two of the food cupboards in the kitchen and all three of the chipmunks are rummaging around inside of them, the items that are inside of the cupboards themselves move about and rearrange themselves without the chipmunks touching them; for instance the items of food next to Alvin as he pours out the packet of Cheese Balls.
Continuity mistake: When Dave throws the muffin basket inside the garbage can there is a clothing item hanging down off of the kitchen seating area, right next to the bin. However a few shots later when we see the bin, the seating is completely clear with nothing on it. But when the chipmunks climb out the bin the item is back on the seat, hanging over the side of it.
Continuity mistake: When Uncle Ian is telling the chipmunks in the dressing room that they need to lip sync along to their song, there are alternating shots, and one of them is Ian and Alvin talking whilst being reflected in a large vanity mirror. However in the shot where Alvin turns around on the vanity table and tells Simon and Theodore they 'have to lip sync', Ian is not reflected in the large mirror, then in the next shot he has appeared back to where he was standing and is once again reflected in the mirror.
Continuity mistake: Dave throws the muffin basket that he stole from Jett Records into his garbage can; and when we see the front of the can there is a handle visible on the side. However when the film goes back to the garbage can (as the chipmunks climb out of it) the handle is no longer visible on the front part of the can that we see, meaning the can itself has somehow rotated.
Continuity mistake: When Ian visits Dave's house on Christmas, bringing over all the gifts and toys for the chipmunks, he hands Dave three large gift-wrapped boxes for them. He then mentions he got Dave a CD and places the wrapped CD on top of the three boxes that Dave is holding. Then when Ian is leaving, between a couple of shots the position of the wrapped CD on the top box differs.
Continuity mistake: When Dave is in the supermarket with the chipmunks, the chipmunks are in the trolley. When Dave turns his back, the chipmunks overload the trolley with boxes of toaster waffles. In the following shots during the whole scene with Dave talking to the chipmunks and then discovering that the chipmunks' song is on the radio, the amount of boxes of waffles in the trolley and the boxes' positions change.
Continuity mistake: When Dave catches Alvin from off the top of his head and traps him inside a woollen hat, he quickly places the hat down on the table and holds the rim of the hat down to prevent him from escaping. However, as he is holding it down the position of the rim of the hat and the actual hat (in his hands) differs from shot to shot.
Continuity mistake: In the shot when we see the chipmunks climbing out of the garbage can that Dave threw the muffin basket into, we can see an ironing board surface to the right of the screen, with just a few items on it. Later on in the kitchen scene where Dave is chasing the chipmunks through the cabinets with a spatula, a whole pile of paper sheets and addition items have appeared on the edge of the ironing board.
Continuity mistake: When the Chipmunks are running through the lobby of Jett Records, trying to get inside Dave's muffin basket, Alvin and Simon get in but Theodore is still running along trying to get in. As Alvin hangs over the edge to try and grab Theodore, he is alternatively standing on or off of the white material that drapes outside the muffin basket.
Continuity mistake: When the chipmunks are in the kitchen, Alvin gets on top of the microwave and opens up two of the cupboards that are full of food. He opens them up and then stands at the ledge of the cupboard in awe, but in the next wider view of the open cupboards he isn't visible at all and has vanished from the shot.
Continuity mistake: When Claire walks over to the signing table that Dave and the chipmunks are sitting at (after their stage performance), she bends down to take a photo of them and Dave holds his hand up and forms a 'peace' sign with his fingers behind the chipmunks. But in the following reverse shot the chipmunks cannot be seen in front of the peace sign, when they should be visible.
Continuity mistake: When Dave awakens after being knocked unconscious by the jar in the kitchen, he stands up next to the sink and in the sink there are two coloured flannels hanging over the basin that are spaced far apart. But in close-ups of the sink they are touching. Also when the chipmunks are playing with the blender there is a tin of "Thai Tea" beside the appliances; but this is only there in close-ups. In wide shots the tin is not there.