Revealing mistake: When Comicus et al are running from the Roman soldiers, Miriam pulls Comicus through a secret marble door. When it closes, you can see the glue residue revealing that it's Formica.
History of the World: Part I (1981)
Plot summary
Directed by: Mel Brooks
Starring: Dom DeLuise, Mel Brooks, Madeline Kahn, Gregory Hines, Harvey Korman
Various times in history are shown in this from the cave man, up until the French French Revolution.
Anthony
More mistakes in History of the World: Part I
Dole Office Clerk: Occupation?
Gladiator - The Roman Empire: Gladiator.
Dole Office Clerk: Did you kill last week?
Gladiator - The Roman Empire: No.
Dole Office Clerk: Did you try to kill last week?
Gladiator - The Roman Empire: Yeah.
Dole Office Clerk: Now, listen, this is your last week of unemployment insurance. Either you kill somebody next week or we're going to have to change your status, got it?
Trivia: Gregory Hines was cast as a last-minute replacement for then controversial comedian Richard Pryor, who had severely burned himself while freebasing cocaine.