When Kelly and Scott have sex on the roof, it begins to rain. Kelley's white shirt becomes transparent, and sticks to her body. When Kelly and Scott roll downward on the roof, Kelly's shirt is completely dry.
Just before the red jeep crashes in the final scene, the right front headlight is already broken prior to the vehicle swerving into the trees at the side of the road.
During the final conversation between the couple as they are discussing trust, her left hand is in her lap, then suddenly on the back of Scott's seat.