Factual error: The Bat signal at the end would not show up like it did in the film. In order to be as clear as it was, as well as visible, it would actually have to shine onto a surface, not just the clouds. They made this same mistake in Returns, but made it believable in the clouds (just not as sharp) in Forever.

Batman (1989)
1 factual error
Directed by: Tim Burton
Starring: Billy Dee Williams, Jack Nicholson, Jack Palance, Kim Basinger, Michael Gough, Michael Keaton, Robert Wuhl
Visible crew/equipment: When the Batmobile is driving itself to Batman and Vicky Vale, you can clearly see a hand turning the steering wheel. (01:12:00)
Vicki Vale: You're insane.
The Joker: Thought I was a Pisces.
Trivia: The Joker says "better make it ten [minutes]", before heading up Gotham Cathedral. Exactly 10 minutes later, the helicopter flies into shot to get him. (01:42:00 - 01:52:00)
Jon Sandys
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Answer: He was suspicious, but when she first entered the penthouse and Grissom said to leave their business meeting, he noticed the sexy facial exchange Alicia and Jack gave each other.