Continuity: When Harry and Sally are in the car driving to New York, in the front shots you see the car has no rear-view mirror.

Continuity: In the fake orgasm scene in the restaurant, when Meg Ryan holds her sandwich up there's one bite out of it, then it flicks on to Billy Crystal and when we see the sandwich again it has two bites out of it, but there was no time for her to have eaten any more. Later it has one bite again.

Continuity: When Harry and Sally are on their way from Chicago to New York, Sally's hair changes. You have to really look for it, but watch the curl in front appear and then disappear.

Continuity: Throughout the movie, Meg Ryan's hair changes styles to depict the different eras. But in a montage of her and Billy Crystal, when it looks like she is doing yet another of her long winded menu requests to an exasperated waiter, he hair is straight and almost waist length. This is her hair style at the very end of the movie, when she and Billy are telling about their wedding cake with the coconut and rich chocolate sauce.