Young and Innocent (1937) - Hitchcock's cameo
Hitchcock's cameo in Young and Innocent (1937) occurs about 16 minutes into the film.
Hitchcock apparently plays the role of a newspaper photographer and is accompanied by a colleague. The pair have an altercation with a police constable and Hitchcock misses his scoop as Robert Tisdall (Derrick De Marney) escapes from the police court in disguise.