Continuity: When the bulldozer is on fire, the raging flames have died down completely in one shot, but are instantly burning brightly again in the next one.

Continuity: When Number 6 is trying to stop the rocket launch, the computer console in the center is emitting smoke in close-ups, but not in long shots.

Continuity: In the interior shot of Number 6 exiting the lighthouse, the red doors are open. When the shot cuts to an exterior view of him coming out, the doors are closed and he opens them again.

Deliberate "mistake": The credits list "Number 86" as played by John Maxim. But no such character appears in the episode. Apparently, 86 was left on the cutting room floor, but the titles weren't altered accordingly.

Continuity: When No.2 is writing on the blackboard, in Question A. The capital letter "F" changes several times between the long shots and close ups. Also in Question B. The position of the first "T" in the word together also shifts position during the same shots, showing that the scene was filmed twice.

Continuity: In the court room scene, Number 6 has wind-blown hair in the master shot, but is nicely combed up and neat in all the close-ups.

Continuity: When Number 6 is pushing him on the swing, the Butler's hands and arms change positions instantly between shots. One moment, he's holding the rope with his hands: in the next, he has his elbows crooked around the ropes instead.

Continuity: During the interview, the Butler puts a coffee pitcher down beside Number 6. In the next shot, it has disappeared.

Continuity: The sling that's been around the Butler's arm and shoulder vanishes after he fans Number 2 with a towel. It's back a few shots later.

Revealing: When they're "playing" on the swing, Number 6 has his hands on the Butler's shoulders, and the Butler is wearing gloves - yet there's a close-up of someone's bare hand holding the rope.

Continuity: While he's making his graduation speech and demanding to know why Number 6 resigned, Number 2 has a mortarboard tassel wardrobe malfunction: it keeps changing sides between shots.

Continuity: In the final scenes, as helicopters are taking off from the Village, the bell tower that's always been there is visible in some shots, but in others, it has disappeared.

Audio problem: Number 48 is still singing when he's carried out near the end - his lips are moving but we don't hear anything. A few shots later, we can hear him again, but his lips aren't moving in sync with the sound.

Visible crew/equipment: Number 6 enters the room with the huge globe, and we "follow" him around a map table. As the camera passes the table, it films its own shadow falling across the map.

Continuity: At the end, Number 6 and the Butler catch a bus near Westminster Bridge in London. The bus that drives up and stops for them has no back platform. But when they board, the style of bus suddenly changes to the more common type with an entrance in the back.

Visible crew/equipment: When Number 48 jumps from the council table, there's a clear shadow on the left of someone holding up a still camera.

Continuity: The council members' signs keep changing during the "Dem Bones" sequence. "Entertainment" becomes "Anarchists" and several others switch places between cuts.

Continuity: In the opening scenes, Number 6 steps onto the elevator with a beard, but arrives on the lower level clean-shaven.