the thing about those hollywood people is ...you have to realize they also "diet down" for their movies.
in rocky IV, stallone weighed 150 lbs at 5'7" (from his own website). franco trained him and drago. drago was at 240 (at 6'5"ish). yet, when you watch the movie (pay attention to the camera angles) they seem like they're the same height.
brutal camera angles.
brad pitt in fight club : 175 lbs at 6ft (take a good look at his arms, brutal 14")
ed norton in american history x: 6ft, 185 (look at his legs, brutally skinny).
examples like these are a plenty; the only claims i could ever see as legit are arnolds in movies, although in movies like predator and commando (in which he's topless the most) i could not see him weighing more than 220. jesse ventura dwarfs him.