 Debbie ReynoldsTammy | Tammy |
 Leslie NielsenPeter Brent | Peter Brent |
 Walter BrennanGrandpa | Grandpa |
 Mala PowersBarbara | Barbara |
 Sidney BlackmerProfessor Brent | Professor Brent |
 Mildred NatwickAunt Renie | Aunt Renie |
 Fay WrayMrs. Brent | Mrs. Brent |
 Philip OberAlfred Bissle | Alfred Bissle |
 Craig HillErnie | Ernie |
| LLouise BeaversOsia | Osia |
 April KentTina | Tina |
| RRalph BrooksParty Guest (uncredited) | Party Guest (uncredited) |
 Lillian CulverWoman at Exhibition (uncredited) | Woman at Exhibition (uncredited) |
| LLucille CurtisFarmer's Wife (uncredited) | Farmer's Wife (uncredited) |
| JJack EdwardsMike (uncredited) | Mike (uncredited) |
| RRobert FilmerDeputy (uncredited) | Deputy (uncredited) |
 Robert F. HoyBoy (uncredited) | Boy (uncredited) |
| LLarry HudsonRevenue Man (uncredited) | Revenue Man (uncredited) |
 Mike LallyPhotographer at Exhibition (uncredited) | Photographer at Exhibition (uncredited) |
 Carl M. LevinessParty Guest (uncredited) | Party Guest (uncredited) |
| JJack MacyFarmer (uncredited) | Farmer (uncredited) |
 Forbes MurrayParty Guest (uncredited) | Party Guest (uncredited) |
| CCamille WilliamsGirl (uncredited) | Girl (uncredited) |
