As a supporting actor, Best, like many black actors of his era, was regularly cast in domestic worker or service-oriented roles (though a few times he played the role echoing his previous occupation as a private chauffeur). He was often seen making a brief comic turn as a hotel, airline or train porter, as well as an elevator operator, custodian, butler, valet, waiter, deliveryman, and once as a launch pilot (in the 1939 movie "Mr. Moto in Danger Island"). Willie Best received screen credit most of the time, which was unusual for "bit players"; most in the 1930s and 1940s were not accorded due credit. This also happened to white actors in small roles, but black actors were not credited even when their roles were larger. In more than 80 of his movies, he was given a proper character name (as opposed to simple descriptions such as "room service waiter" or "shoe-shine boy"), beginning with his second film.