Other mistake: In the scene where Kevin is making the hotel reservation on the phone, the lady does not even ask the dates of when he will be arriving and leaving the Plaza.

Home Alone 2: Lost in New York (1992)
Plot summary
Directed by: Chris Columbus
Starring: Tim Curry, Catherine O'Hara, Daniel Stern, John Heard, Joe Pesci, Macaulay Culkin
The McCallisters are going on holiday, this time they lose Kevin at the airport and he gets on the wrong plane. His family are in Florida and he is in New York. After going toy shopping, staying in an expensive hotel, and terrorizing the 'wet bandits' in his uncle's empty house, he finds his family at the end. His mother finds him at a Christmas tree and the whole family spends Christmas in New York.
Kate McCallister: What kind of idiots do you have working here?
Desk Clerk: The finest in New York.
Trivia: The kid that plays Kevin's cousin Fuller is Macaulay Culkin's brother, Kieran.
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.