Continuity: The way Poitier hold/talks on the phone with his father, inviting him to dinner is inconsistent between shots.
Continuity: The car that Tracey backs into already has a dent in the front door panel. During the accident the relative position of the two cars and the number of dents in the side panels change with each change in shot.
Continuity: When Matt and Christina are at Mel's Drive-in, the rear view projection of the street shows it running perpendicular to the parking lot. During the actual shots of the property, the street runs parallel to it.
Continuity: When Matt is dressing before dinner and talking to Monsignor Ryan, he begins to tie his tie. When the camera switches to a front view of him, he hasn't begun to tie it yet and is still buttoning his top button.
Continuity: The car the Draytons are driving is a two-door sedan (with a pillar holding the roof up, and a full frame around the door glass) when seen in exterior shots. Once they're at the drive-in, it becomes a two-door hardtop (no pillar, and no frame around the glass).
Revealing mistakes: Just before Drayton crashes his car into Frankie's, the dent on the side of Frankie's car is already present.
Continuity: While shaving before dinner, Matt has varying amounts of shaving cream on his face while speaking with Christina.