Deliberate mistake: Bender goes back in time to two minutes before Fry came back to the past. But if you time it, it was actually only 1 minute and 42 seconds.
Futurama: Bender's Big Score (2007)
1 deliberate mistake
Directed by: Dwayne Carey-Hill
Starring: John DiMaggio, Katey Sagal, Tress MacNeille, Billy West
Continuity mistake: In the hybraxi, Al Gore's blazer is blue and he is wearing a red tie, but in the next shot, it is brown and he has no tie.
Professor Farnsworth: Time travel is impossible!
Fry: But Professor, you time traveled yourself. Remember? When we went back to Roswell?
Professor Farnsworth: That proves nothing! And furthermore, you'd think I could remember a thing like that! Plus, who are you anyway?