Guess Who's Coming to Dinner (1967)

Deliberate "mistake": There is no glass in Spencer Tracy's eyeglasses.

Continuity: When Hepburn and Tracy park their car at the drive-in parking lot and order ice cream, the same large white truck (going left) and the same station wagon (going right) pass by on the street behind them three times. On this same loop there is also a white car that twice pulls out into the street going left.

Revealing: When Spencer Tracey backs his car into the hotrod at the ice cream stand, you can see the hotrod already has a sizable dent before the car makes contact, probably a result of a previous take.

The daughter was played by Katharine Hepburn's real life niece, Katharine Houghton.

There is a scene in the Drayton home where Joey tells John that the tiny statue of her Father that he is holding, was made by her mother. That statue is indeed of Spencer Tracy and was actually made and given to him by Katharine Hepburn.

The movie makers got Poiter to sign on after telling him that Spencer and Katharine were going to be in the film. They in fact had not signed on at that point.