How to Win Friends and Influence Nazis - S3-E7
Deliberate mistake: Burkhalter pulls some papers out of his bags marked "Top Secret." Why would German papers be marked in English, so the prisoners know what not to look at?
Jeannie, the Hip Hippie - S3-E6
Deliberate mistake: Phil Spector is credited as having played "Steve Davis", but that name is never used in the episode; he is instead addressed by his real name.
Deliberate mistake: Pfister states that there are two minutes until he destroys the world, but when he begins preparing, if you use a stopwatch, two minutes never pass, the clock that Pfister reads from is just exceptionally fast.