Richie is told they do not have any Absinthe yet later he is drinking some.
The final question of the pub quiz is about Pop music and the question is "Berlin is the capital of which country? Germany." That question is obviously Geography.
Just before Richie gets his crotch set on fire by Eddie, you can see the flammable substance already smeared on his trousers.
When Richie tries to follow Spudgun and Hedgehog into Eddie's room and the door is slammed in his face and he bumps into it, the walls wobble and in one corner of the landing a crack of light appears for a split second, caused by the set walls becoming momentarily detached.
When Richie examines one of Eddie's forged bank notes and says "Hang on a sec..." the camera jolts.
As the pub landlord, Dick Head, pours a pint of Pernod for Richie it's obvious that the bottle is empty and the liquid is already in the glass.
After Dave Hedgehog says "Could it be daffodils?" the next shot is a group shot in which Christopher Ryan and Steven O'Donnell are corpsing.
When Richie, Spudgun and Dave Hedgehog are holding the olives, Spudgun and Dave Hedgehog shout up to Eddie to save them from Richie, Dave Hedgehog shouts 'ADE!' instead of Eddie, Ade is Adrian Edmondson (Eddie).