Continuity mistake: Right before the tree gets stuck on the axle of the red truck, there is a shot of the car turning. The tires are already chewed up from the scene coming up where they try to take off.
Visible crew/equipment: Near the beginning, Jo is in Beltzer's van fixing a wire. At the beginning of this shot, the camera moves down from high before she opens the door. As it's doing this, you can make out a reflection of it on the glass.
Continuity mistake: When the tornado at the drive-in makes the sign with the titles of the movies fall, the arrow on the upper part of the sign is pointing to the left. However, when the upper sign detaches and heads into the garage, the arrow is pointing to the right.
Suggested correction: It's during a tornado. Things are going to be blown every which way.
