The footage of the car crashing and flipping over has become a Troma trademark and in-joke. It was used again in Tromeo and Juliet (1996) and then as another inside joke (for those who spotted it in all three films) in Terror Firmer (1999).
The film was spun-off from the character Kabuki-Boy in The Toxic Avenger Part II (1989). Lloyd Kaufman jokingly mentioned he was making a movie about the character and Japanese investors became interested.
When Harry Griswold is being yelled at by his Police Chief for wearing a clown costume, you can see a poster on the Chief's table saying "WANTED" in huge letters and showing a picture of the directors, Lloyd Kaufman and Michael Herz.