Harry Enfield states on the commentary that during the scene where Sharon climbs into bed with him at the end of the party, that was the first time he'd put his tongue in the mouth of another woman since he'd been married.
The scene where Kevin and Perry are scrubbing Eyeball Paul's floor had to be shot quickly because Rhys Ifans had to get on his flight to America to film The Replacements.
James Fleet who plays Kevin's dad in the movie, actually played his school teacher in Harry Enfield and Chums.
When Kevin and Perry hit the town and see German men marching. The lead German is played by Director Ed Bye.
In the scene where Kevin signs for his dad's credit card, the address is fictitious and the last part of the post code is 5EX