A contemporary item listed the gorilla Naba for a role in the movie, but the Call Bureau Cast Service has Ray Corrigan in the role. All scenes with the gorilla appear to be an actor in a gorilla suit.
During the climactic chase, smoke and steam are emerging from the locomotive, indicating that this was not footage printed in reverse but that the train actually was moving backwards.
Based on the play "The Rear Car" which opened in Los Angeles, California, USA, on 6 August 1922, but had no New York run.
Both Harry Semels as "Evil Eye" and Akim Tamiroff as "Italian Man" are supposed to be in the movie, but neither one appears.