 | Harold Lloyd als Dr. 'Jack' Jackson |
 | Mildred Davis als The Sick-Little-Well-Girl |
 | John T. Prince als Charles F. Haskell - Her Father |
 | Eric Mayne als Dr. Ludwig von Saulsbourg |
 | C. Norman Hammond als Jamison - the Lawyer |
 | Jackie Condon als Boy's Pal (uncredited) |
 | Mickey Daniels als Boy Patient (uncredited) |
 | Richard Daniels als Man (uncredited) |
 | William Gillespie als Card Player (uncredited) |
 | Wally Howe als Asylum Guard (uncredited) |
| James T. Kelley als Card-Playing Father (uncredited) |
| 'Auntie' Mackay als Undetermined Secondary Role (uncredited) |
| Florence Mayon als Card Player's Daughter (uncredited) |
| Oscar Morgan als Undetermined Secondary Role (uncredited) |
 | Charles Stevenson als Asylum Guard (uncredited) |
| Anna Townsend als Jamison's Mother (uncredited) |
 | Dorothy Vernon als Restaurant Hostess (uncredited) |
| Joy Winthrop als Undetermined Secondary Role (uncredited) |
| Sam Taylor | Story |
| Fred C. Newmeyer | Director |
| Walter Lundin | Director of Photography |
| Hal Roach | Story |
| Jean C. Havez | Story |
| Thomas J. Crizer | Editor |
| Robert A. Golden | Assistant Director |
| Hal Roach | Producer |
| Sam Taylor | Director |
| H.M. Walker | Title Designer |
| Thomas J. Crizer | Writer |
| Robert Israel | Conductor |
| Robert Israel | Music Arranger |
| Robert Israel | Original Music Composer |
