Revealing mistake: The muzzles of the the crew's guns are usually empty, but when they need to actually fire them, you can see a black insert sticking out which is the little pyro charge.
Continuity mistake: The weather on Terminal has changed from Summer to Winter overnight. When Avon first beams down, it's obviously warm and all the trees have leaves. The very next day, all the trees are bare and there's snow all over the ground. (00:01:30)
Continuity mistake: Avon apparently found a hair salon somewhere on the supposedly deserted planet Terminal. Between the time he and his crew were marooned in the previous episode and the events in this one, he's suddenly acquired a spiffy new blow-dry haircut. (00:03:10)
Continuity mistake: Vila makes an improbable costume change in this episode. He's wearing one outfit at the end of "Terminal," when Liberator is destroyed, and another outfit entirely here, where he's supposedly marooned on the planet with the remainder of the crew. Did he take time to smuggle a spare set of clothes off the ship, even though it was disintegrating at the time? (00:03:30)
Continuity mistake: The planet Terminal changes shape and color completely from its appearance in the previous episode. Where it was blue-green and cigar shaped before, it is now gray, striped like a yarn ball, and round. (00:07:00)
Continuity mistake: Tarrant's hair seems to have grown at least an inch overnight. It's longer and bushier than it was in "Terminal," which supposedly took place the day before. (00:09:45)
Continuity mistake: The damaged Orac has long loose wires hanging out when Dorian carries it off the ship, but they disappear in the next shot, when he enters the base. (00:24:40)
Continuity mistake: After Scorpio has landed on Xenon, the lift rotates 180 ready for launch. Yet after Pella boards the ship, it is seen rotating again.
Character mistake: When discussing Ensor, Avon says he'd spent 20 years of his life in hiding. Yet in 1-13 "Orac" Blake said he hadn't been seen for 40 years.
Deliberate mistake: Because Paul Darrow had turned an ankle while shooting the fight scene with Gunsar, the uninjured Avon is inexplicably limping throughout most of the fight. (00:14:00)
Continuity mistake: Cato's body moves to a different spot on the floor relative to the unconscious Avon, who also moves. (The two are suddenly much farther apart than before.) Cato's hands also change positions. (00:31:40 - 00:35:00)
Continuity mistake: At the end, Dayna and Tarrant, shortly followed by Soolin and Vila, all teleport to Scorpio without wearing the necessary bracelets. (00:47:35)
Revealing mistake: On Scorpio, the barrel of Avon's gun is bent.
Character mistake: Gunsar refers to his predecessor as Maverick, but on the recording Nina calls him Marvick.
Visible crew/equipment: When the crew are discussing Helotrix, big yellow power cables (probably used to light up Scorpio's main flight console) are showing at the right of the screen. (00:09:20)
Revealing mistake: BBC costume recycling allows one of the natives on Helotrix to show up wearing one of Tarrant's old 3rd season outfits. Another wears an even older, 1st season costume of Avon's. (00:22:40 - 00:24:25)
Continuity mistake: The president-elect's body changes both poses and locations on the floor between the time Sleer shoots him and the time he's found and the murder investigation is begun. (00:26:00 - 00:31:25)
Continuity mistake: Tarrant and Dayna mug a pair of Helotrix citizens and change clothes with them. Later, when the pair are beamed back to Scorpio, they change back into their original costumes in mid-teleport. (00:44:05)
