Over his career, Moore played small parts such as servants, bootblacks, elevator operators, menial laborers, and, especially, railroad porters and Red Caps.

In Meet John Doe, he played a City Hall janitor trying to smoke a cigar while washing the floor on the Christmas Eve that John Doe has threatened to jump off the building.

Moore was part of Preston Sturges' unofficial "stock company" of character actors, appearing in six of Sturges' films.

[2] In Sullivan's Travels, Moore played a chef who is propelled headfirst through the roof of the land yacht during a chase scene.

Moore was also a dancer, but that skill was not often called for in his film appearances.