I think that quite a few things in the movie seems to be fake?
The big-hand high-five scene.. very convenient that one of the victims happen to carry in the (red) soup .. nots sure if it indicates fake or not, but sure is convenient
The jetski scene.. who'd make such a scene without placing a camera which films the actual landing? (you only see it from somewhat above, not the actual ground impact)
The scooter-store scene.. the keys just happens to be in it? .. and driving out through a windows like that is beyond dangerous - serious risk of getting seriously hurt or even have your throat cut.. I know these guys do insane shit, but still
The midget bar scene .. Wee-man is way to famous to pull this off - people, even in a bar, would rekognize him right away.
The sweatsuit cocktail scene .. there's a cut between filling the cup with sweat and the actual drinking.. you just dont do that in such a scene
The tooth-pull out scene .. didnt that guy loose that very same tooth earlier? Could that just be pulling out a fake tooth here? Just guessing
The gorilla scene .. the sound the "animal" makes are clearly dubbed - and without those sounds it would never be very convincing I think. Maybe they use some sort of speaker in the suit or something - but that would be quite hard to do because such a beast delivers some quite mean bass
Maybe a long shot..
Viva La Bam was obviously scriptet like insane - they even used computer graphics for some stuff (how lame is that) - that's why I'm kinda sceptic about this