Trivia: There is a scene where Kevin is walking past a driveway just as Harry and Marv are driving down it, and they stop just in time to avoid hitting him. This was achieved by having Macaulay Culkin walk backwards, as the van was driven in reverse away from him; the film was then shown backwards. It's hard to tell - but if you look at the smoke from the exhaust, it's drifting toward the van rather than away from it.
Trivia: In the beginning of the movie, after the pizza fight scene, Kevin's dad unintentionally throws away Kevin's passport flight ticket to Florida that was hiding in napkins, after the milk from Kevin shoving Buzz into on the table spills over, causing his dad to wipe it up. Kevin wouldn't have got to come along anyhow.