1. Think that hair is completely unrealistic?
  2. Think that that outfit is incredibly inappropriate for that job?
  3. Wonder how they ran in those shoes?
  4. Wonder who has to master the sounds of violence to do special effects?
    And if they have nightmares
  5. Wonder how many times, if any, the actors broke during a funny scene
    Suggested by @sarahsmith4
  6. Get totally caught up in continuity issues? (E.g. The coffee cup's in a character's left hand, then it's on the table, then it's in the hand again.)
    Suggested by @readjulia
  7. Think about how many people it takes to make just one show and wonder how much money you could make working on a TV show?
    Suggested by @laneeeee_sue