Continuity mistake: In the scene where Caesar orders his guards to kill and seize Mel Brooks, he calls for more wine and a servant comes to pour him some If you notice his shirt, it is clean and white. In the shot right after he calls for it, when the servant is walking up behind Caesar laughing, you can see that Caesar's shirt is stained purple. This is caused from repeated takes, because right after the servant walks up he spills the entire container on Caesar. But yet, in the finished movie, Caesar's shirt is purple before it even gets spilled on.
History of the World: Part I (1981)
1 continuity mistake - chronological order
Directed by: Mel Brooks
Starring: Dom DeLuise, Mel Brooks, Madeline Kahn, Gregory Hines, Harvey Korman
Revealing mistake: During the Inquisition song when Right Before Mel Brooks Plays bongos on the guys heads he slides in from behind the wooden torture things. If you look closely the hair on the stunt double sliding in is darker than Mel's.
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.