I DON'T BUY IT(spoilers)

Possibly the main mark was real,but not possibly the 3 that you see gingerly pushing him off the roof at the end.I say that because the way they were laughing it off when they found out it was a reality show stunt.If I were stupid enough to be fooled into killing someone on video I'd have gone medieval on their asses and there's no way anyone would see me killing someone!!!