This was the first film ever to be set specifically in Kilkenny City, Ireland.
For the montage where Dave pukes in various scenarios, the vomit was created using cold mushroom soup.
The character of Walshey was actually an amalgamation of two characters, the original Walshey and a sidekick he had called Knob. It was originally the character of Knob who urinated on the shop floor in the shop scene.
The First A.D. Luke Harris appears in the film countless times throughout. He is seen wearing three different sets of clothes on the Saturday night scenes. He is also the guy who headbutts Kevin and walks away with Laura in the dream sequence.