In Rose and Miles's skydiving class, there are at least 9 first time skydivers equipped with solo parachute rigs and only 2 jumpmasters to accompany them. The main skydiving instructor informs the students that their parachutes will open automatically upon exiting the airplane. This form of skydiving is known as static line parachuting. But in actuality, the vast majority of first time skydivers jump tandem, a type of skydiving where a student skydiver is connected to a harness attached to a tandem instructor. Tandem skydiving relieves the student of the pressure of having to deploy their own parachute and the pressure of having to guide themselves safely to the ground, which is why it's the most common method for first time jumpers.
At Rose and Miles's skydiving class, the instructor reminds the students to tuck and roll once they hit the ground. In actuality, tucking and rolling is not a regular practice in recreational skydiving.
When Rex hurts Dorothy and Blanche asks him to leave, Blanche slams the door behind him. The sound, instead of corresponding with the door, follows seconds after.