Trivia: Hitchcock's cameo is towards the beginning on the train. The little boy is playing with his hat.
Blackmail (1929)
1 trivia entry
Directed by: Alfred Hitchcock
Starring: Anny Ondra, Charles Paton, John Longden, Sara Allgood
Continuity mistake: When the artist speaks to his landlady, his walking cane is tucked horizontally under his arm. In the very next shot, however, the cane jumps to a vertical position and is now in his hand. (00:21:00)
Alice White: You and your Scotland Yard. If it weren't for Edgar Wallace, nobody'd ever heard of it.