During the scene where Jacob goes to a party with Jezebel, the song "Lady Marmalade" is playing in the background, which is fine if it's 1975 as we are led to believe throughout most of the movie. However, at the end we find out that all of the action happening in "present day" was a hallucination that Jacob was having in 1970-ish, therefore, there is no way that Jacob could have known that song, which came out in 1974.
The blue sedan with US Government plates that chases Jacob is a 1975 Ford LTD. This was the first model year to have the style of tail lights shown in the film. According to the facts revealed at the end of the story, there should be no vehicles newer than 1971.
In the scene where Jacob and Geary are walking down the stairs, Geary is holding his briefcase with his left hand. After he says "war games in Thailand" and makes a motion with his right hand, the next shot shows that hand now holding the brief case.
The goof item below may give away important plot points.
Incorrectly regarded as goofs
The B train (that Jacob is riding) does not stop at Bergen Street and never did. However, because this takes place in Jacob's hallucination, this may be a deliberate goof made in the character Jacob's subconscious.