Continuity mistake: When Jack is having a seizure at his job he stuff some aspirin in his mouth. When the manager says "He is spaced out." it cuts to the girl saying "I'll handle this.". At that point Jack has got two aspirin hanging out of his mouth. It cuts and the aspirins are gone. (00:30:20)

Innerspace (1987)
Ending / spoiler
Directed by: Joe Dante
Starring: Dennis Quaid, Meg Ryan, Martin Short, Kevin McCarthy
Jack and Lydia get to the lab in time to get Tuck back to normal size. Tuck and Lydia get married, and are driven to their honeymoon by the Cowboy with Scrimshaw and Canker in the trunk. Jack realizes the Cowboy was the driver, so he takes off after the limo to save Lydia and Tuck. The last shot is of Jack speeding after them in Tuck's car.
Lifesava
Mr. Wormwood: You've got a great future in front of you in Retail Food marketing, and I just hate to see you throw it all away by going psycho on us.
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.
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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.