A "bit role" refers to a small and minor part played by an actor or actress in a movie, play, or TV show. It is a brief appearance with only a few lines or moments on-screen. Full definition
There are some smaller, quirky bit roles in the film. (nextprojection.com)
Jenkins also charts his path to success in a business he knew he wanted to be in since he was a kid and recounts those many years riding the train from Illinois to play bit roles in New York - based TV shows and films. (deadline.com)
Those were perhaps the highlights of a career mainly constituted by unbilled, bit roles as cops, military officers, small - time gangsters, and even the occasional sheriff (Oh, Susannah! (rottentomatoes.com)