Hollywood 1947 Rules Overview 

It's similar in that certain members of the group will be contributing cards that affect the result for each round. It's different in that each player has a unique job to affect the game (Screenwriter chooses which movie to make, Editor can filter cards out, Actor can improve hands, Gaffer has extra influence on who plays, etc), players always have a hand of 3 cards that they need to actively manage so that they don't get stuck with cards that hurt their team, different numbers of players will be adding cards each round (could be 1, could be 9), all players have the option of affecting who will play that round (by re-rolling any two dice), there is a Rising Star loyalty that plays both sides, etc. So yeah, pretty different. After playing each round of Hollywood I've actually never heard the comparison made to Secret Hitler since it plays and feels so different. Good question!