John Williams' score for the film is a song called "Somewhere In My Memory". It's used mainly as soundtrack for both Home Alone films, however he did a couple different recordings of the song itself. The full song done just with vocals is on the Home Alone 2: Lost in New York (1992) music soundtrack with Bette Midler.
From 1993 to 1997, NBC aired 'Home Alone' during the 8/7c time slot on Thanksgiving evening as part of their holiday promotion.
The issue of Playboy that Kevin finds in Buzz's room is from July 1989 with Erika Eleniak as Miss July.
Little Nero's Pizza is an parody of Little Caesar's Pizza. "Caesar" was the title used by Roman emperors, such as Nero.
Robert De Niro turned down the role of Harry
The wax-and-plastic artificial snow used in this film was given to the Lyric Opera of Chicago when shooting finished. It has since been used in numerous opera productions.
Although the part was written especially for Macaulay Culkin by John Hughes, several hundred other boys were auditioned by director Chris Columbus just because he wanted to confirm that Culkin was right for the part.
The film that the family is watching while in the hotel in France is It's a Wonderful Life (1946).
# # The car that ''Santa'' (the guy Kevin talks to about getting his family back) starts before it stalls out is a 1980 Honda Civic hatchback.
Despite filming a family movie, Daniel Stern once slipped in the "s-word", which can be heard when he is retrieving his boot through the doggy door at 55:27 on the DVD.
# # Joe Pesci kept forgetting that he was filming a "family" movie during his characters on-screen outbursts so director Chris Columbus advised him to say "fridge" instead of the "F-word".
The posters and DVD cases for the movie had Culkin with his hands on his face and screaming, based on the famous painting "The Scream" by Edvard Munch.
Entered into The Guinness Book of World Records as the "Highest Box Office Gross - Comedy", accumulating $533,000,000 internationally.
Jeffrey Wiseman who plays the inquisitive neighbor, Mitch Murphy, auditioned for the role of Kevin McCallister.
Joe Pesci's character, Harry Lime, is named after Orson Welles's character from the film The Third Man (1949).