There Were Giants in the Earth - S1-E5
Revealing mistake: The Robot's lights wink out for a few seconds as it disables the force field.
Urutora sakusen dai ichi gô - S1-E2
Revealing mistake: When Bemular drops the submarine, this does not fall in a plausible trajectory but it is yanked away mid-fall with a string by someone off-screen. (00:19:15)
It's All Done with Mirrors - S1-E27
Revealing mistake: During Scott and Kelly's scuffle in the restaurant, the stunt men's faces are visible several times. (00:27:25)