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: The VTOL hits Bemular with two missiles the second time that Hayata makes him come out of the water. The second missile causes an explosion with the special effect applied in the wrong spot, a spot in the back of the monster that is practically the opposite of the direction in the line of shot. (00:17:50)
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)