Revealing mistake: When Ade Edmondson clamps the pliers onto Rik Mayall's nose, if you watch carefully you can see the pliers bend a couple of times, showing that they are made of rubber or something similar. (00:13:45)
Bottom's Up - S1-E5
Continuity mistake: When Richie and Eddie are on the roof and Richie starts his rain dance, watch the bottom of his trousers. To start of with he pulls the hem up to around his shins. He then starts and pulls his groin or something and stops and at this point the right hand trouser falls back down his leg. Then straight afterwards in the long shot you can see that it's back up again without him pulling it up.
Richie: Well Eddie, we learn something new every day. Today I learned that you're a complete bastard!
Trivia: Adrian Edmondson and Rik Mayall met at drama college in 1975. Adrian said he couldn't stand the sight of Rik and when he saw him he thought...well what a tosser.