Continuity mistake: When Avon & Co. barnstorm the ruined lab, a large piece of plastic debris on the floor is there when they enter, but then disappears between takes. Avon actually slips on it coming in, and does a hilariously un-macho little balancing dance. To quote (and agree with) actor Paul Darrow: "I can't believe they left that in!" (00:45:00)
Headhunter - S4-E6
Continuity mistake: Muller and Vila have a brief struggle over the teleport console. When Muller grabs at the controls, Vila pulls his hand away, making the teleport lever break off and fall onto the console. It fixes itself again a short time later. (00:06:05)
Headhunter - S4-E6
Continuity mistake: Relative to the white striping on Scorpio's deck, the unconscious Vila changes locations on the floor three times between shots. (00:21:10)
Headhunter - S4-E6
Continuity mistake: Muller's wife teleports holding her spacesuit gloves with the fingers pointing up. She arrives with them in the same position, but when the shot cuts, they've reversed positions and the fingers are now pointing down. (00:28:40)
Headhunter - S4-E6
Continuity mistake: The headless android falls into a pile of rubble after an explosion, getting up with its red, white & blue striped costume in smudgy tatters. A moment later, its outfit is mended and completely clean. Still later, when the android is walking outside, its costume is dirty and shredded again. (00:33:30 - 00:35:00)
Continuity mistake: During the punch-up with Cancer, Tarrant's holster is missing.
Continuity mistake: The computer simulation shoots Gerren in the left shoulder, but when the Scorpio crew teleport him up to let Soolin render first aid, he's holding his right shoulder instead. (00:06:30 - 00:08:00)
Continuity mistake: Orac is in two places at once: he's sitting on the console, plainly visible in front of Dayna as she calls the landing party - but in the next shot of the crew over on the orbiter, Vila is holding Orac. (00:40:45)
Continuity mistake: Villa is carrying Orac and Soo Ling is about to play the quick draw game, cut to the bridge and Dana walks over to the captain's chair to contact Avon and the top of Orac can be seen in front of her.
Continuity mistake: When Dayna and Tarrant find Keeler unconscious, Tarrant's teleport bracelet disappears between shots. It's back a few shots later, though. (00:15:40 - 00:16:10)
Continuity mistake: Tarrant beams down to the refinery complex and back again without a teleport bracelet.
Continuity mistake: After revealing Avon & Soolin are still alive, there is no magazine in Avon's gun.
Continuity mistake: Dayna plants the grenade by the right-hand upright of the ladder. Yet when it detonates you can see the blast is to the left and in front of the guard; presumably to prevent it from going off right in the stuntman's face.
Continuity mistake: When they shoot open the crate containing the gold, Avon is on the left & Keeler on the right. Avon fires and we see the right-hand lock explode, then Keeler shoots and the left-hand lock pops.
Continuity mistake: Just before Scorpio crashes, Avon grabs Orac and teleports to safety. When they're still aboard the ship, Orac has several wires hanging loose from underneath. When they materialize on the planet, however, all the loose wires are magically repaired and no longer hanging. (00:16:30 - 00:17:45)