Continuity mistake: Kevin takes photos of the Wet Bandits robbing Duncan's Toy Chest. Later on when the police look at a photo, it doesn't match up to when it was taken - they didn't have money in their hands.

Home Alone 2: Lost in New York (1992)
41 continuity mistakes - chronological order
Directed by: Chris Columbus
Starring: Tim Curry, Catherine O'Hara, Daniel Stern, John Heard, Joe Pesci, Macaulay Culkin
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.
Kate McCallister: What kind of idiots do you have working here?
Desk Clerk: The finest in New York.

Trivia: In the scene where Kevin is first entering the Plaza, he stops to ask a man where he might find the lobby. The man Kevin stops is Donald Trump, owner of the Plaza.
Question: How does Kevin manage to keep quiet the events of the first Home Alone movie involving Harry and Marv without anyone else in the family knowing, especially the parents? I imagine that Kevin would've had to take time off from school to testify against Harry and Marv in courts. And even if the trial took place during the summer months, I would think Kevin's parents would have had to consent, or at least have knowledge, to their son testifying in court against the two burglars.
Answer: Harry and Marv were career criminals, who expect to spend some time in jail or prison. Considering how they were caught and the police being able to link them to burglaries where the water was left running, it would be likely that they pleaded guilty (meaning there was no trial or need for anyone to testify) in exchange for a shorter sentence.
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Chosen answer: Remember that Kevin didn't give his name, nor did the police ever see him. When he called, it was from a different address and he gave his name as "Murphy." There is no reason to think that Harry and Marv would tell the police about Kevin, since they would have to admit being outsmarted by a child and also admit to kidnapping, assault, battery, and a wide array of charges for what they tried to do to him. Even if he did testify, there is no reason to think his parents wouldn't know.
Greg Dwyer
And by the way Kevin knew nobody would believe him.
Not entirely correct - He rang the Police from the phone in his parents bedroom just before the spider scene.