Visible crew/equipment: During the argument Cay and Vivian are having outside look at the car. You can see the reflection of the camera. Not only that but in the background is a crew member trying to stay hidden behind a parked car.
Visible crew/equipment: When Cay and Vivian are sitting on the floor of Vivian's room at night look at the window carefully. You can see the reflection of the camera in it.
Revealing mistake: When Cay and Vivian are out in the desert it starts raining. Yet once they're in the car after the big kiss they seem completely dry with their hair only slightly damp. Clearly they just got their hair sprayed.
Plot hole: It's never explained why Frances Parker would be upset about Cay pursuing Vivian. She knows she's gay, but we're never told why she's mad.