Visible crew/equipment: During the Battle of Bull Run, just before the first shell is fired towards the plantation house, at the upper part of the screen you can see a helicopter flying over the battle action. (01:45:00)
Pigeon Post - S1-E3
Continuity mistake: The size of the paper Rene uses for the pigeon grows substantially when Herr Flick find it near the end of the episode. (00:19:45 - 00:29:20)