Revealing mistake: When Jerzei is coming through the door with an axe, you can see the door is paper thin to make it easier to get through. In fact you can see Alexei Sayle being very careful to only chip small bits away because a decent whack with the axe would smash the whole thing down.
Revealing mistake: When Vyvyan is trying to show off his finger trick there are two mistakes, 1) the fingers are bent the other way (this shows that the hand is fake), 2) when he cuts off the wrong finger there is blood shooting out but you can see the tube of blood right near his wrist.
Revealing mistake: When Rik kicks the window though, the entire frame wobbles. (00:02:45)
Revealing mistake: After Rik catches the golf ball and runs into his room, as he closes the door the entire wall wobbles. (00:16:00)
Demolition - S1-E1
Revealing mistake: When Vivian jumps through the wall half way through the episode, the entire wall wobbles. (00:21:00)
Revealing mistake: When Neil starts to sneeze, he carefully puts his hands close to his nose to give the impression that the green jet is coming from his nose. However, in one shot, just before the guys bag him we see the jet appearing from his hand while his hand is several centimetres from his nose.
Revealing mistake: When Ftumch hits Saunders, some of Ftumch's red make-up rubs off onto Saunders' face.
Demolition - S1-E1
Revealing mistake: When Vivian punches the wall to stop the tap, the entire wall wobbles. (00:10:30)
Revealing mistake: The guys turn on the TV and discover the channels don't work. When Rik changes the channels, he leans in front of the TV hiding the screen. This is because the 'channel' never changes at all - it's just a picture stuck onto the TV. You can see this when the camera rotates around, just before the screen goes out of view, behind Rik.
Demolition - S1-E1
Revealing mistake: When Rik is watching 'Nozin' Aroun'' on TV, he dislikes the program and smashed the TV with his foot. You can still briefly see the image of the show on the TV, even though the TV is smashed. This means the effects people didn't take the image off the green screen quick enough. Also, a few seconds later when Rik is talking to Mike, there are spikes of the screen remaining around the edge of the TV. However, they are green - the remains of the green screen.
Revealing mistake: When Rik jumps in his bed with the magazine and the circular saw comes out, watch closely and you can see the bed and sheets are already in two halves.
Revealing mistake: After Mike burns the stumps (aka Rik), the special patch that was set on fire on the back of Rik's overalls is visible.
Revealing mistake: When the vampire is shaving himself in the toilet, the reflection in the mirror of his shaving cream, clothes and gloves is almost, but not quite, identical to his movements. The empty suit in the mirror and the visible part in front of it were shot separately by copying the other part's movements as closely as possible, as the surviving raw footage can prove. It's hard to see, but there is a small difference between the motion of the hands.
Revealing mistake: Near the start, when Vyvyan sticks his hand through the wall to swear at Rick, you can see where the holes from previous takes have been papered and painted over.
Interesting - S1-E5
Revealing mistake: When Rik Mayall is in the middle of the doorway dancing to the Human League record, you can see him abruptly change his dance steps and deliberately move across to his left (our right) to give the two Police officers room to get past him to destroy the record player. He had his back to the front door the whole time and wouldn't have been able to see them come in.
Revealing mistake: When Neil is about to blow up the kettle, watch as he plugs it in. The power point moves a bit.
Chosen answer: It wasn't referring to anything real, just that the government's bureaucratic naming, The Guardian's mangled spelling or Rick's bad pronounciation resulted in the unlikely word "Footumch" being spoken.
Sierra1 ★