Continuity mistake: Avon refers to Tarrant hitting him "over the back of the head." But Tarrant didn't. He struck Avon from the front, on the forehead, and not from behind. (00:05:30 - 00:40:45)
Blake's 7 (1978)
1 mistake in Powerplay
Starring: Jan Chappell, Michael Keating, Paul Darrow, Peter Tuddenham
Trivia: The box-like entrances to the underground lair proved problematic for the Space Rat actors. When several of them were supposed to spill out on cue, the box walls and their heavy helmets prevented them from hearing the director, who repeatedly screamed "Action!" to no avail. A lone voice from inside the box eventually shouted back, "Can't hear you!"