Tesoro, mi si è allargato il ragazzino

Much of the the dialogue between Wayne and Adam, such as the bedtime story and feeding time, was improvised by Rick Moranis in response to whatever Daniel Shalikar and Joshua Shalikar, the twins who played Adam, happened to say.

The final scene--and the punchline--of the first film features the shrinking machine in reverse, and the family feasts on enlarged food. In fact, reversing the effects of the machine is how the kids went from tiny to normal size. In the second film, Wayne is working for a company that is testing a completely different machine that will enlarge things, and the shrink machine is in storage. It is never explained why simply reversing his shrink machine wasn't the answer.

Adam's laugh can be heard after end credits

Many scenes were omitted for its theatrical release version, but added to its TV version:

• More scenes of Nick and Mandy running through neighborhood looking for Adam
• Mean magician neighbor pulling colored handkerchiefs out of her coat
• After Adam pulls ad sign out from ground and drops it, he steps on it
• After Nick gives Mandy a giant raisin, he tells her to relax because they're headed for Vegas
• After Adam catches the car with Nick and Mandy in it, he talks to them before stuffing them in his pocket
• Diane giving Wayne reasons why she should be enlarged to save Adam
• More scenes of Adam talking to the crowd below when he arrives in Vegas
• More scenes of the TV reporter explaining situation with Adam when he first arrives at desert highway and when he's playing "Hard Rock Cafe" guitar.

Featured in Siskel & Ebert & the Movies: A Stranger Among Us/Man Trouble/Honey, I Blew Up the Kid/Cool World/The Hours and Times (1992)