Continuity mistake: At the end, when the parrot is going into the igloo, the igloo looks tiny from the outside, as if Alex would barely fit in there. But when the parrot goes into the igloo, the man can fit in there and there is so much more space in it.
Continuity mistake: Alex places Doris (in his box) down on the table in the attic. The phone and remote control are neatly placed on the edge. However the shot changes to show Doris placed in between the phone and remote, which have changed places. (00:34:30)
Continuity mistake: Alex's mother goes to make him a sandwich and squeezes jelly onto the bread. The shot comes back after both Alex and his mother talk before she goes out. The jelly has mysteriously been spread.
Continuity mistake: Mr. Beaupre is talking to Alex in the garage, and Alex walks backwards away from him, he nearly touches the wooden shelf behind him. When it cuts to a wideshot Alex is now much further away from the shelf, and when it cuts to another closeup he once again walks back into the shelf. (01:29:16)
Continuity mistake: When the FBI are rushing to reach Alex, as the snowploughs sweep the spy's car aside the front plough sweeps to the left. Further down the street the front plough sweeps to the right.
Continuity mistake: In the very first shot of the Mom, she carries in a load of boxes. Two green ones are included, one with writing above the other. When she unstacks them, the shot pans out a little bit, and the boxes are positioned differently.
Continuity mistake: When Unger gets run over by his criminal partner, look at the driver side window. Making initial contact with the car, it is closed. For the close up shot, it's wide open, and when the car turns, it's only open a couple of inches.
Audio problem: When Unger shoots his pistol into the sewerpipe in the basement, his gun has a silencer but the gunshot you hear is not silenced.
Factual error: During the remote control car chase the bad guys' minivan drives directly over it at one point. From the view of the toy car, you can see a driveshaft running down the centre of the undercarriage, which would be impossible on a front-wheel-drive vehicle like the Nissan Quest they're driving, which use half axles to drive the front wheels.
Continuity mistake: Alex's Dad hangs up the steamer in the attic, when Alex informs him that his taxi arrives. The metal holder the steamer hangs on changes position with every shot.
Continuity mistake: At one point, the mother gets an audible page. When she looks at the display to see the number, you can clearly see that the pager is set to "silent." (00:29:20)
Continuity mistake: Alex puts the present down to take off his hat and scarf, by the front door. Between shots the present moves a few inches closer to the bag next to it. (00:11:00)
Other mistake: When Alex's mum calls the woman thief at the scene where the thieves are redirecting the phone calls, the screen shows Alex's mum dialling a number. The call is redirected to the thief's mobile, but notice that on the computer screen, "Interrupt" is spelled wrong, and instead is spelled "Interupt".
Factual error: In real life (there are a couple of scenes like this) snow doesn't fall from the sky at the intensity it was from clear skies.
Continuity mistake: In the scene where Alex's mum is about to leave his room after applying lotion to his chest. Alex's hair is slightly scruffy - when the shot comes back to him after being on the mum his hair is combed and neat.
Character mistake: When Jernigan chases the car, he tells the team, "It's heading south on Adams." The toy car then turns left, which means that the car should be heading east. However, Jernigan tells the team that the car is headed west.