In the "morning scene" after Rachel and her grandmother has had breakfast the shops are opening and one of the shopkeepers puts the "open" sign up facing inwards, the sign should have said "closed" when seen from that side of the door if the shop was open for business.
In the beginning of the movie, Rachel lies down in the shade of a billboard on the side of the road. When they cut to the wide shot the shadow of the billboard is on the opposite side so Rachel is in sunlight. This might have symbolized the passing of time, but in the next shot, when Harlen comes to wake her, she is clearly in the shade again.
When Rachel visits Georgia for the first time, she has rather worn off reddish nail polish. When she wakes up in the morning on the couch, obviously zoned out because of all the walking, without time to do much about her appearance, she has a professional looking French manicure. In the next scene she has red nail polish again.
When Lilly returns to Idaho to confront Rachel, the wide shot shows her parking crooked, then the tire close up shows perfectly straight parking that is one inch from the curb. The wide shot of Lilly leaving the car shows the car parked crooked and the back tire about 6 inches from the curb.
The flowers in front of Georgia's home change. The first several scenes show her planting vibrant colors with many yellow and pink flowers. Later scenes only have pale purple flowers in front of the house.
On the first morning Rachel is in her grandmother's house, her grandmother is having her breakfast alone. The scene clearly shows a book with a blue picture on the cover kept on the corner of the table. Just then Rachel enters with the very same book in her hand and keeps it on the same spot.
When Georgia is in the kitchen at breakfast time with Harlan and Rachel, she sits down at the table and sets down a plate with two well-cooked pancakes in front of her. In the following shots, the pancakes not only change position without Georgia touching them, but are now more lightly cooked.
The Idaho license plates on the vehicles in the film have an incorrect format. Standard Idaho license plates begin with a two digit number/letter combination identifying the county where the vehicle is registered (i.e. 1A - for Ada county, Boise area). The plates in the film do not use this format.
Rachel slides off her panties while trying to seduce Harlan, and when she offers to let him "touch it", she parts her legs slightly and it can clearly be seen that she's wearing another pair of panties.