Factual error: In the scene where Tucker is talking with Hugh Hefner, the chess board in the background is set up backwards. The pieces are basic Stanton style, and the kings and queens are obviously in the wrong positions.
Visible crew/equipment: At the start of the scene where Evan is racing to the school to get to the choir, you see some buildings. If you look down when the angle is turning to the right, it focuses on some cranes, a camera, and a wire holding it up, and a crew member is visible in the reflection of a red window.
Continuity mistake: In the carnivorous plant scene, Manny grabs the fruit (the bait), which is sitting in the middle of the plant. In the next few shots, the bait disappears and then is replaced with a bulb that housed the red and blue "wires".
Revealing mistake: After Chuck steps on the toy duck, he looks up to see the alien family and their house behind them. However, there is no reflection of this on his visor, just an empty field and the trees beyond.
Factual error: After James leaves the bar and is driving, you see a dealership in the background and you can see new trucks and a new model yellow mustang. The movie takes place in 1987, so the vehicles are about 20 years too new. (01:26:00)
Continuity mistake: In the scene where Clouseau is having his hair shampooed, the amount of shampoo on Ponton's hands changes, and then the suds disappear. (01:07:40)
Character mistake: Just after the birth of Mona's child, Farhan recollects "uss waqt agar Virus kehta kay mera pouta engineer.". In fact the child is not his "pouta" but his "nata"
Continuity mistake: When Garzooka goes to Garfield's house, he pounds on the door and it appears as big as him. But after he breaks the door open, the doorway is thinner. (00:17:05)
Factual error: If you're a Hertz #1 Club Gold Member like Ryan is, you don't need to swipe your card or sign for a rental as shown in 2 scenes. You just go to your assigned car in the lot and show your driver's license at the exit.
Continuity mistake: When Columbus brushes Wichita's hair behind her ear and kisses her, he leaves his hand behind her ear. Her hair changes position between shots; in some it is all behind her ear, in some it is over Columbus' hand, and in others it is half and half.
Other mistake: At Paul's wedding, Paul gives a speech saying that Connor was always there for him, "ever since our parents died when I was 2 and Connor was 7". However, in the scene showing when Connor and Jenny were just kids and she gives him a camera for his birthday, Jenny and Connor appear to be at least 10 years old - certainly not 7. Connor tells his ghost, "that was the summer before my parents died". The scene that follows shows the parents funeral, with Paul sitting next to Connor, and Paul appears to be about 5 or 6 years old - but much older than 2.
Visible crew/equipment: The crew is reflected on the motorcycle-cop helmet when Mark says "He is not drunk".
Continuity mistake: When they go into the garbage chute Hutch goes in head first, but comes out at the bottom feet first yet had no room to swivel round.
Continuity mistake: During Kate and Steve's day off, while talking by the kitchen counter, Steve's hand is either up or down without any continuity at all.
Continuity mistake: When the crane breaks, it only drops one end of the cable with the hook into the hole. However, later on Mary makes a contraption which the cable snapped and both ends are in the hole, going up over the pulley on the crane. The number of cables going into the hole from the crane varies for the remainder of the movie from 1 to 2 cables - and is not to be confused with the string of lights.
Other mistake: Bowling score for Aram shows a 65 in the 4th frame. A strike would add 20 points to his score, which should be a 66 in the 4th. (01:01:37)
Factual error: When the guys first set up the website to accept submissions, the year is 1997. We see a shot of the computer screen which displays that they are running Windows XP, which wasn't released until 2001.
Continuity mistake: After escaping Bean Annex on the motorcycle by going off the ramp, Kylie turns back, sees the wolf and does a double take, and tells Mr. Fox "don't turn around". But when everyone looks at the wolf in the next shot when the motorcycle has stopped, they're looking off to the side of the road, not behind them. (01:11:20)
Continuity mistake: In the scene where Bruce and Andy are hiding from Animal Control with the dogs, the two Animal Control people step on the "Bone Sweet Bone" pillow and leave a dirty footprint. When Friday goes to get it later, it is clean.