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
Continuity mistake: In the beginning, after Dennis Quaid has been beaten up, the pins on his jacket are pinned, then hanging askew, then pinned again. (00:03:55)
Victor Scrimshaw: In lieu of champagne, how about some real pain? Propane?
Trivia: In the scene where Jack Putter's nightmare (about the overpriced items) becomes real while he's at work, a customer in line wearing glasses and a gray jacket says, "at $800 a bottle, who'd want to?". This was Chuck Jones. This is one of many references to "Looney Tunes"
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.