After the argument at Cindy's workplace, Dean's necklace is visibly broken with the chain hanging down the front of his shirt. In the next shot, the necklace is intact again.
During the scene at the doctor's office the assistant is wearing blue gloves on both hands. She hands equipment to the doctor and in the next shot, from a different camera angle, the assistant suddenly isn't wearing any gloves.
When Cindy runs through the sprinkler at her dads, she turns back and her shirt is not wet. The shot goes to Dean and then comes back to her and her shirt is wet.
In the beginning of the film, when Dean goes outside to look for the dog with Frankie, he takes his cigarette out of his mouth, puts Frankie down and the next shot the cigarette is back in his mouth.
At the end of the movie when Dean and Cindy are fighting at her dad's house it is clear outside when they enter and leave the house, but pouring rain is seen through the back window.
All the cars driven by the actors had Pennsylvania license plates on the front. That is inaccurate, since in Pennsylvania you only get one license plate, which goes on the back.
When Cindy is in the waiting room leaving the doctor's office after changing her mind, there is a brand new Ford SUV visible through the storefront window.
When Dean and Cindy are embracing outside the clinic in the flashback, a man in the background walks behind a sign and does not emerge until some time later. It could be that the Production Assistant told him to stay there, because you also see the PA step out from behind the tree next to the sign and immediately go back behind the tree again.
During a 'past' flashback when Dean and Cindy are outside the Boutique store, the camera focuses and moves with Cindy, while that's happening, a car drives by and being a night scene, the headlights from the car briefly illuminates both Cindy and the Cameraman's shadow on the background wall. (at around 54 mins)
When Dean is decorating Walter's room for him, he hangs the U.S. flag incorrectly. The flag should be hung with the union (the blue section) on the left, even when hung vertically.