Leo Gorcey's character name is spelled "Mugs" in the credits, but as "Muggs" in the film, when it is seen printed in a letter.
Eddie Mills's character name is "Dave" in the credits, but he's called by his actual name, "Eddie," in the heat of a fight.
J. Farrell MacDonald's character appears as "Hanagan" in the credits but is called "Flanagan" in the film.
When mobsters throw Pete back in his chair, the whole back wall shakes, revealing it as a stage wall.