Continuity mistake: Tony Trihull appears when Finn McMissile begins chasing Professor Z. It also shows when Tony uses his magnet. When it is used, Finn's equipment are pulled by the magnet, which includes his bullets. Those bullets are black when all of them were going out. However, when they are pulled onto the magnet they are grey.
Continuity mistake: When Johnny and Kate are having dinner in her apartment and Ambrose knocks on the door, Kate puts all the dinner away leaving a few candles on the table. The table is still like this when Kate and Ambrose leave the apartment, but when Johnny notices that the killer cleaner is in the apartment, the table is set up again.
Continuity mistake: After Popper gets the other penguins he opens the box and leaves it in the living room, but when the kid opens the door the box disappears.
Continuity mistake: When Alvin is making the big SOS sign, one shot shows the whole beach and Simon and Theodore are in the middle of the big letter O. In the next shot, they are at the O's edge.
Continuity mistake: In the scene where Linda and Blu are on the computer, when Tulio "communicates" with Blu, the computer is way too much to the right. It reappears when Blu starts squawking.
Continuity mistake: Mitch's hair changes frequently when he is talking to his dad about the wedding.
Continuity mistake: When Jay slaps Si in the balls, his right hand is holding on to his bag, camera cuts and it's down by his side. Camera cuts again and it's back on his bag. (00:08:10)
Continuity mistake: When Matt, his family and Barry is sitting and eating dinner Barry fills his glass almost full with wine until the mother of Matt stops him. In the next shot the is glass filled to the brim. (00:11:05)
Continuity mistake: When the bird first hits the RV, a blood stain is visible on the windshield. But on the exterior shot of the RV as it stops, the blood has disappeared. (00:26:50)
Continuity mistake: The false bottom of the locked desk drawer goes from being a solid piece when Elizabeth Halsey accesses it to a bottom that splits in half when the K9 officer accesses it.
Continuity mistake: When Rango was at the mayor's office, the mayor grabs out a jug of water, and he opens the lid. But in the next shot, the lid is sealed again.
Continuity mistake: When the guys take off to Bangkok on their direct flight, the plane is a 4 engine jet. When they land, it's a 2 engine jet.
Continuity mistake: After Slide locks Josh's boss in the master bedroom closet within Mr. Fitzhugh's ex-apartment, he turns on the boombox at a high volume. Then later in the film, when they are retrieving the car through the window of the same apartment, the music is off. Then later, Josh's boss is seen trying to get out of the closet and the music is back on. (01:08:20 - 01:19:55)
Continuity mistake: When visiting grandpa, Rodrick is given a glass of milk. He takes a large gulp and theatrically spits over Greg, soaking his shirt, but then they cut back to the glass on the table and there is still the same amount of milk in it.
Continuity mistake: At the end of the first film Mumble has lost most of his down, because his bow tie has yellow markings, however in the second movie he has somehow grown his down back.
Continuity mistake: When EB is young and is in the factory for the first time, he picks up some sweets off the factory line. The amount of sweets in his hand then changes between shots.
Continuity mistake: Just before the Smurfs are returned to the Winslows, Patrick consoles Grace. She is wearing black tights under her white dress. Then the Smurfs return on pigeon-back, and miraculously she is now bare-legged.
Continuity mistake: When Eddie walks in to the doctor's office and talks to "brows gone wild" the woman with the green shirt has it kind of loose around her breasts. The next shot of her, the green shirt is tight and tucked into her pants/skirt. Then on her way out the door, the green shirt is loose, the same way as the first shot.
Continuity mistake: The interior shots of the airliner to Vegas depict a wide-body, two-aisle airliner. However, the aircraft shown during take-off is a Boeing 757, a narrow-body, single-aisle airliner.
Continuity mistake: Neil McCormac - the main character - has a bust up with his American girlfriend. From the first angle he has only got a T-shirt on, then the camera changes angle and he suddenly has a sweater on. Then the camera angle goes back again and he's lost the sweater again. (01:15:00)