Continuity mistake: When Carol enters Melvin's building soaking wet to tell him she'll never sleep with him, we can see bra straps across her back under her blouse. But at Melvin's door, she's embarrassed to discover that the wet blouse reveals a distinct lack of a brassiere.
Continuity mistake: Carol drives the Saab convertible to Baltimore, and she expresses to pull over the car, the rooftop is down. When Carol actually pulls over the Saab the car has the roof on. (01:26:40)
Continuity mistake: On the way to Baltimore in the car while Jack Nicholson is discussing noodle salad the convertible top is both up and down during different shots of the scene.
Suggested correction: It shows no such thing. In fact Carol has been so thoroughly soaked that both her T-shirt and bra are wet and have become transparent as a result, and her boobs are showing through.
Not true. She has no bra straps showing when at the door talking, wet shirt. When she leaves and turns, the straps are present, wet shirt.