The 'Film Yearbook Volume 4' said that this movie was a "parody burlesque of Warner Brothers gangster films". The picture ironically though wasn't made at Warners, the film was made at 20th Century Fox.
The real name of Johnny Dangerously was Johnny Kelly. In the closing credits, this character played by Michael Keaton is billed only as Johnny Dangerously.
When Johnny says he joined the Jocko Dundee Gang full time there is a picture of him and the gang with Vermin, but Vermin doesn't join the gang until two scenes later.