While inputting the very last line of dialog into the editing system, the computer system crashed and the movie was lost for 2 weeks. They managed to find an older edited version of the movie and had to make up time.
Lots of original music was done by Boyd Mitchell in Australia, sent via email to Brett McCartney who then added other sounds and vocals.
There are 3 easter eggs on the DVD's and Blu Ray's....and to the film makers knowledge, no one has found any of them.
The bike falling over gag happened by accident. The kickstands on the bikes were faulty and couldn't hold the weight of the bikes causing them to fall over. This is a running joke in the movie.
There are many references to favourite movies of the film makers. Example, the Breakfast Club dance on the top of the wall and just about every line of Cliff.