When Jesse locks her motel room door about halfway through the movie, the deadbolt goes from locked to unlocked and back to locked between shots.
When Jesse is wiping the fake blood from her neck and shoulders in the mirror, and Ruby comes to help, the blood stains change shape continuously from one shot to the next.
When Dean comes to see Jesse at the motel and hands her the roses, Jesse reaches out and grabs them with her left hand but when she faints, the roses appear in her right hand.
When the mountain lion in Jesi's room roars the sound used is the roar of an African Lion (or possibly a tiger) not that of a California Mountain Lion.
Jesi says when asked that the blond color of her hair is natural. But it can been seen in several scenes that her hair are dyed.
The shoot Jessie does with Jack is a nude one, and her reaction when he asks her to fully undress infers that she didn't know it would be. The laws concerning nude photography state that the actor or model must know well in advance what the conditions will be, what will be seen, and so on and so forth. If Jessie did know in advance, then she wouldn't have arrived on set fully clothed - as she would have to have make-up done for her whole body (and if she were having pictures taken fully clothed, she would have to pause after they were taken to have make-up redone for the nude shots). She would instead be wearing a robe, which she would be free to change into when not shooting. Jack also dismisses everyone to make it a closed set - which means non-essential crew members are not present for the nudity. Ruby is also dismissed but, as a make-up artist, she would be considered essential to touch up Jessie's (especially when shooting under hot studio lights). Jack would have gotten into serious legal trouble for coercing a model to shoot nude when they didn't know, even more-so that the model in question is a 17 year old minor.
If Jesse was 16, she would have been too young to have a driving license. After the photo-shoot, she tells Ruby that she 'has to go before her meter runs out.'
When Jesse signs her parental consent form (20:13), she signs with her left hand (ok, maybe she's left handed) and writes from right to left.
When Jessie kisses herself in the mirror during her modeling scene, the mirror on her right is already stained with lipstick before she touches it with her lips, in the next shot as she goes to kiss the mirror on her left the lipstick stains on the right are suddenly gone.
At around 6 min, as Ruby turns to wipe Jessi's chest, a microphone can be seen in a mirror.