Continuity mistake: In the first film, it is mentioned several times that Kevin is 8 years old. However, in this film it is stated that he is 10. When his parents are in the Miami airport security office, they say that he was left alone last Christmas. That would make him 9. Both films take place the same days, from about three days before Christmas until Christmas morning, so even if Kevin is born around Christmas time this is still a mistake.
Audio problem: When Kevin plays the tape of his Uncle Frank singing in the shower, it starts with "We know a guy that can really do the cool jerk" twice. Yet, when he first tapes his Uncle, he doesn't start the recording until after that has been sung. The recording also sounds very clear. When he tapes him the door is closed, but the tape sounds the same throughout. Also, when his Uncle says he's gonna "slap him silly" Kevin shuts the door behind him and you can hear it shut. On the tape there is no sound of the door shutting.ShooterMcGavin34
Continuity mistake: When Kevin is first watching the movie in the hotel room the room service guy already has two scoops of ice cream in the dish and is putting in a third. Then later in the scene the guy asks, "Two scoops, sir?" and only one scoop is in the dish and is just putting the second scoop in.
Factual error: When Kevin goes in the limo, the front desk manager attempts to process a charge on the credit card, which comes back as "stolen." No credit card terminal flashes "stolen" when a credit card has been compromised or cancelled. The machine would simply decline the transaction, much like if the credit limit had been exceeded, or tell the merchant to phone for authorization.
Continuity mistake: When the robbers are in Duncan's Toy Chest at midnight, Kevin sets up his board on the bucket outside the window. He then knocks on the window, takes the robber's picture, then runs back away and pulls a rock out of his pocket to throw through it. But he wouldn't have been able to run back that far without jumping over the bucket and board, and he did not jump or avoid any obstacles.Hawk
Continuity mistake: Once Kevin and the attendant board the plane to NYC to make sure Kevin's family is on board, there is a shot of Kevin while he says, "There's my dad over there." In the background, a man is sliding his black coat off of his shoulders. Two shots later when the attendant says, "Well, go find an empty seat," in the background you will see the exact same man taking his coat off a second time.