Film debut of Daniel Keyes.
Film debut of Al Pacino.
Frequently missed shot: Mom tells Patty Duke's character it'd be nice if she came over for dinner, cooked a chicken (i.e., wants her to be more 'normal'). Her response is that it'll be a cold day in hell before she's so conventional. In the final shot of the film, Patty is riding a motor scooter in downtown New York, going to visit her mom, hoping to reconcile. There's a plucked chicken in the basket on the back of the scooter.