Other mistake: When Jack (Martin Short) is injected with the syringe, it's done in his butt cheek, through his pants, just below the waist of his coat. We then see later Margaret looking at photos taken during the scene, one of them shows the syringe injected through Jack's coat into his thigh/butt cheek area.
Innerspace (1987)
1 other mistake
Directed by: Joe Dante
Starring: Dennis Quaid, Meg Ryan, Martin Short, Kevin McCarthy
Revealing mistake: When Jack is hanging out of the truck you can see him standing on the hood of the car which Lydia is driving. At some points we get camera view from the back seat of the car. In some angles the mirror inside the car disappear. This is to prevent us from seeing the camera. (01:04:15)
Victor Scrimshaw: In lieu of champagne, how about some real pain? Propane?
Trivia: After Scrimshaw and Canker are shrunk 50%, there are a few scenes where they are seen with full-size actors. These shots were actually filmed using forced perspective. For the car scene, the rear of the car is actually twice as large as a normal car rear, and was about 20 feet away. During the scene half size hands and double-size heads were used. Using this method, the film-makers didn't have to worry about compositing two separate shots in post production, so the shots could be completed quicker. Even in the final scene with the suitcase, the case was twice as large, but the hand that closes it was real, closer to the camera in sync with the closing. (It took about 20 takes before it was perfect).
Question: When Tuck is inside Jack he can't go through the heart - is this because Jack would have a heart attack or because Tuck would die?
Answer: I would say both probably.
Answer: Probably, but most likely it's because Jack's pod is fragile and wouldn't survive the shock wave heartbeats. The pod is experimental and built for scientific observation, not battle.