Ted unbuckles his pants and (at a minimum) unzips them as well. After he's attacked by Smalls, his pants are shown as buckled, zipped and secured around his waist.
After Nick is killed by Smalls and when Smalls has vanished in the night, Nick's body visibly moves when Molly watches him from inside the car.
The rifle that Jimmy shoots at Mollie while standing on the airport control tower is a "Break Barrel" pellet gun, not a real firearm rifle.
Look closely at the fore end of the wood stock and you can see a hinge mechanism which allows the barrel to be moved downward which compresses the internal spring and piston and also exposing the chamber where the pellet is loaded by hand.
When the red car was shown at the airport it was a 64 or 65 Pontiac GTO. On the road, as she is driving, it is a 68 Olds.
When Molly is eating the chocolate bar, it's perfectly intact. After walking through the desert for as long as she has, it would be a melted mess.
The burnt out vehicle with burnt driver, has no engine, and other items not in place in the engine bay.
When Molly is running towards the red car, a crew member can be seen reflected in the car.
GoPro mounted on the side of the red convertible, visible in the shot directly before the one the GoPro was used for, of Molly's reflection in the mirror.