| Cast | Harold Lloyd (as Dr. Jackson), Mildred Davis (as The Sick-Little-Well-Girl), John T. Prince (as Her Father), Eric Mayne (as Dr. Ludwig von Saulsbourg), C. Norman Hammond (as Jamison), Charles Stevenson (as Asylum Guard) |
| Cinematographer | Walter Lundin |
| Director | Fred C. Newmeyer, Sam Taylor |
| Distributor | Associated Exhibitors |
| Editor | Thomas J. Crizer |
| Producer | Hal Roach |
| Production Company | Hal Roach Studios |
| Writer | Jean C. Havez, Hal Roach, Sam Taylor, H.M. Walker |
| Links | https://www.imdb.com/title/tt0013075/ · https://en.wikipedia.org/wiki/Dr._Jack |