Other mistake: At the end when the naked but invisible hero runs from the police but is given away by his footprints in the snow, the footprints are of shoes, not bare feet.
The Invisible Man (1933)
1 other mistake - chronological order
Directed by: James Whale
Starring: Claude Rains, Henry Travers, Gloria Stuart, William Harrigan
Other mistake: At the end when the naked but invisible hero runs from the police but is given away by his footprints in the snow, the footprints are of shoes, not bare feet.
The Invisible Man: And if you try and escape by the window, I shall follow you, and no-one in the world can save you.
Trivia: A purely technical error with all "invisible man/woman/boy" movies is that the eye works by interacting with light incident upon the retina. The Invisible Man is made so by being rendered transparent to visible light. This means that his eyes no longer interact with light - so he ought to be completely blind. (However, a healthy suspension of disbelief makes for a great story.).