Buster Keaton as Projectionist / Sherlock, Jr.

Kathryn McGuire as Girl

Joe Keaton as Girl's Father / Man on Film Screen

Erwin Connelly as Hired Man / Butler

Ward Crane as Sheik / Villain

Doris Deane as Girl Who Loses Dollar Outside Cinema (uncredited)

Christine Francis as Candy Store Girl (uncredited)

George Davis as Conspirator (uncredited)

Kewpie Morgan as Conspirator (uncredited)

Steve Murphy as Conspirator (uncredited)

John Patrick as Conspirator (uncredited)

Betsy Ann Hisle as Little Girl (uncredited)

Ford West as Theatre Manager / Gillette (uncredited)