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 McCauley 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: The Railroad tracks that Kevin crosses are in Winnetka, Ill. behind Hubbard Woods Metra Station. Right across the street is the drug store that Kevin steals the toothbrush from.
Trivia: When Marv grabs Kevin, Kevin grabs his tarantula spider and puts it on Marv, who then screams. Daniel Stern had to mime his scream because the noise would have scared the spider, and the scream was dubbed in later.
Trivia: When Kevin is in Buzz's bedroom, he finds in the box a picture of Buzz's girlfriend. This is actually a picture of boy made up to look like a girl, because the director, Chris Columbus, thought it would be too harsh to make fun of a girl like that.
Trivia: During the scene where Harry bites Kevin's finger, Joe Pesci actually bit Macaulay Culkin, leaving him with a scar on his finger.