At the start of the line dancing scene where Ray Von is deejaying, if you have the subtitles on, it says the song is Hillbilly Rock, Hillbilly Roll by the Woolpackers. It's actually 5,6,7,8 by Steps. (I'm quite embarrassed I know that).
Actor Patrick McGuinness, who plays Paddy the doorman is actually Peter Kay's best friend in real life. They also appear in a John Smith advert together.