Factual error: The picture of Eddie and Teddy on the road with dad, supposedly taken in 1906, shows a Ringling Bros and Barnum & Bailey circus poster. In 1906, the Ringling Brothers circus and the Barnum & Bailey circus were two separate circuses playing in different parts of the country. They did not combine the two shows until 1919. (00:27:00)
Factual error: When Judge Reinhold is in the department store playing the Space Invaders video game, and one of the men chasing the skull comes to talk to him, Judge continues to play the game, so the man stands between him and the screen in order to get his full attention. If you watch the screen, the game actually continues to play on.
Factual error: When Johnny shoots the taxi with some kind of cable and pulls it backwards, the rear tires are shown to be spinning in an attempt to move. The taxi is a Chrysler K-car which is front wheel drive.
Factual error: The closing credits give thanks to "FAO Schwartz", misspelling the name of the famous toy store with an extra "T".