Movie: Altered States (1980)

Tagline: When he heard his cry for help it wasn't human
Trivia: Author Paddy Chayefsky disowned this movie. Even though the dialogue in the screenplay was almost verbatim from his novel he reportedly objected to the over the top shouting of his words by the actors.
Goofs: Continuity: While Arthur takes Eddie's blood and Mason is yelling at him, the position of the bloody rag used to wipe Eddie's face clean as well as the EEG wiring changes positions between shots.
"An American researching different states of consciousness with the aid of mind altering drugs and an isolation chamber begins to experience disturbing physical changes in his body that point toward an evolutionary regression. Written by Keith Loh <loh@sfu.ca>"