3. There is a legend that Elvis Presley (who died in 1977) made a cameo in the movie. Many of those who believe that Elvis is still alive maintain that, the heavily bearded man standing in the background of the scene where Mrs. MacCallister is shouting at the desk clerk (just before she meets John Candy) is Elvis.
8. The Talkboy was originally conceived as a non-working prop for Home Alone, used by Macaulay Culkin's character. In 1993 it was made into a retail version, brought on by a massive letter-writing campaign by young fans of the film.
9. John Candy filmed his part in only 1 day, albeit an extremely long 23-hour day. The story about having once forgotten his son at a funeral home was entirely improvised. His part is obviously inspired by the character he played in Planes, Trains & Automobiles.