Revealing: Jenna moves down the corridor on her way to the hold with her Liberator gun in hand. The weapon lights up and flashes several times, even though she isn't firing it.

Revealing: The double-bladed axe one of the Decimas uses to attack the station windows is wobbling as he strikes with it. Small wonder he's not getting far at breaking in, with a weapon made of rubber.

Revealing: When Tel Varon walks in front of the wall screen in the justice data center, a flash of gibberish lettering and a blue matte line both appear briefly above his head.

Revealing: When Tarrant, trying to call Dayna, falls against the flight deck console, the whole thing tilts visibly.

Revealing: When the Federation troopers blow open the interrogation room door, you can see a brief glimpse, through the smoke, of the thrown sledge hammer that was used to make the door fall in.

Continuity: 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.

Visible crew/equipment: When Vila is talking to Cally on the flight deck, the boom shadow moves across the Liberator's control console.

Visible crew/equipment: On the flight deck, an equipment shadow sweeps across Jenna's hair as Cally says, "It's a beacon signal."

Continuity: During Blake's first encounter with Cally, the smudges on the front of his tunic (including a big chalky footprint left by her boot) disappear, reappear and rearrange themselves several times between shots.

Revealing: Just after Avon slips into the access tunnel and the prisoners close the hatch behind him, the star field in the window shakes and wobbles.

Plot hole: When the Liberator returns to the planet, Travis remarks that their orbit is too far away to use their matter transmitter. Since Travis had only found out that they even HAD a matter transmitter (which the Federation hasn't managed to develop yet) when he spoke to a technician just before that, how would he know what the range was?

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.

Revealing: 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.

Revealing: When Liberator moves into view on Servalan's screen and stops, a bad special effects matte causes the stars behind the ship to keep on sliding to the right.

Plot hole: How very perspicacious of the clone masters to create their duplicate Blakes wearing the exact same outfit that the real Blake happens to have on in this episode, considering they have never seen Blake in person.

Visible crew/equipment: When Zarkov puts a record on his antique phonograph, the metal desk behind him reflects a camera dolly rolling by.

Continuity: During the firefight in the detention corridors, the blaster holes in the metal wall Jenna's firing toward keep changing, sometimes disappearing altogether. One of them is created twice, appearing as the troopers duck out of sight, vanishing and then reappearing in the same spot when Jenna fires again.

Visible crew/equipment: After Avon says, "I haven't been anywhere near them," and sits down on the flight couch, part of the camera dolly moves across the bottom of the screen.

Revealing: Stock footage of the London's launch from Earth is run in reverse when it lands, supposedly 8 months later, on Cygnus Alpha. What are the odds that a remote penal planet will have a launching pad with configurations, lights, buildings and background terrain all completely identical to the launch stage on Earth?