When Greg Wilson attempts the helicopter stunt at the beginning of the film, there is a black winch apparatus visible in the back of the helicopter. When the helicopter lands after Greg's fall, the hold of the helicopter is empty. The winch returns for for Glen's attempt, and is visible throughout.
When B.J. Parswell is rushing to the set in her yellow Porsche 914 to warn Glen about the killer, her car can be seen parked behind Glen on the set as he is being taken to the helicopter to perform his stunt.
When the stunt crew is preparing to do the house burning stunt and they shout "We're going on air!" (at 1:12 in) they show a stopwatch in Patti's hand. Jack and Blake's dialogue from the actual movie script in a previous scene is shown under Patti's hand with the stopwatch.