Teenage friends Kit and Libby make prank phone calls for fun but then find themselves involved in a brutal double murder committed by one of their targets.
Is I Saw What You Did on Netflix? Unfortunately the movie I Saw What You Did is not yet available on Netflix.
| Directing | William Castle | Director |
| Writing | William P. McGivern | Screenplay |
| Writing | Ursula Curtiss | Novel |
| Production | William Castle | Producer |
| Production | Dona Holloway | Associate Producer |
| Sound | Van Alexander | Original Music Composer |
| Camera | Joseph F. Biroc | Director of Photography |
| Editing | Edwin H. Bryant | Editor |
| Art | Alexander Golitzen | Art Direction |
| Art | Walter M. Simonds | Art Direction |
| Art | John McCarthy Jr. | Set Decoration |
| Art | George Milo | Set Decoration |
| Costume & Make-Up | Larry Germain | Hairstylist |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Production | John Morrison | Unit Production Manager |
| Directing | Terry Morse Jr. | Assistant Director |
| Sound | David H. Moriarty | Sound |
| Sound | Waldon O. Watson | Sound |
| Crew | Corna Day | Stunt Double |
| Sound | Joseph Gershenson | Music Supervisor |
| Sound | Ethmer Roten | Musician |
| Crew | Frank Weatherwax | Animal Wrangler |
