Why are actors sometimes uncredited for example Tom Sizemore and Seth Green in Enemy Of The State?

Answer 1

In old films, some minor characters might not have been listed in the credits. For example, someone who moves a patient from one room to another. Today there are multiple reasons: The actor hates the film and does not want to be associated with it. This is more common with directors than actors. A big star might like a particular role but it's too small for his star power. An actor is just doing a favor for another director or actor who is involved in a production. It could be an inside joke for the fans.

Answer 2

Some actors are uncredited in movies because there parts are too small too be represented with a character name. Some directors, for example, will have a cameo in their films, but not play an actual character in the film.

Answer 3

Seth Green, Tom Sizemore, Jason Robards, and Philip Baker Hall all made uncredited appearances at their own behest.