Doktor Jack Skuespillere og folkene bag
Harold LloydDr. 'Jack' Jackson Mildred DavisThe Sick-Little-Well-Girl John T. PrinceCharles F. Haskell - Her Father Eric MayneDr. Ludwig von Saulsbourg C. Norman HammondJamison - the Lawyer Jackie CondonBoy's Pal (uncredited) Mickey DanielsBoy Patient (uncredited) Richard DanielsMan (uncredited) William GillespieCard Player (uncredited) Wally HoweAsylum Guard (uncredited) James T. KelleyCard-Playing Father (uncredited) 'Auntie' MackayUndetermined Secondary Role (uncredited) Florence MayonCard Player's Daughter (uncredited) Oscar MorganUndetermined Secondary Role (uncredited) Charles StevensonAsylum Guard (uncredited) Anna TownsendJamison's Mother (uncredited) Dorothy VernonRestaurant Hostess (uncredited) Joy WinthropUndetermined Secondary Role (uncredited) Sam TaylorInstruktør / Handling Fred C. NewmeyerInstruktør Thomas J. CrizerForfatter / Filmklipper Hal RoachProducer / Handling Walter LundinDirector Of Photography Robert A. GoldenAssisterende instruktør 
