Don't forget :
6. Fish-eye lens. Usually with some shiny-suited rapper shaking their head or groin at it.
7. Helicopters. Record company given you more money than you can spend on dancing girls and fireworks? Time for a helicopter or twelve.
8. Freakish costumed extras looking at camera. (Bonus points awarded for overbright spotlight between shots, bored-looking extras, siamese twins)
9. Dwarves.
10. Slowing the song down in the middle and having Sean "Puffy" Combes attempt to dance, accompanied by several of the above effects, for no reason at all.