Walter Slezak who plays Baron, the mastermind, had a long career in films, dating back to European silent films in 1922.
This film has a 100% rating based on 5 critic reviews on Rotten Tomatoes.
Billy Wilder contributed to writing a German version of the screenplay for Emil and the Detectives (1935).
In a Sept 6, 1963 article in Stars and Stripes, reporter James Gunter writes "Walt Disney said six American children selected in Europe as tryouts will appear in his new movie, Emil and the Detectives (1964), to be filmed in Berlin and West Germany this Fall." Roles were won by Bryan Richardson of Wiesbaden, David Petrychka of Munich, Ann Noland of Berlin, Bob Swann of Kaiserslautern and Rick and Ronald Johnson, twin boys from Bad Toelz. Peter Herold, associate producer of Emil and the Detectives, said camera work on the picture will begin Monday (9/9/1963) in Augsfeld, West Germany, about 60 miles north of Frankfurt. The cast will move to Berlin Sept. 16 to work on the picture for about 10 weeks (through about November 23).
The 45th Live-Action film produced by Disney.