*Big *is on the channel Pop right now and they are going over T.Hanks’s big idea for a hit toy. A (I assume color) flatscreen computer of comic book dimensions that allows readers to play “choose your own adventure” comics that are stored on exchangeable disks. With a production cost of $7.00. In 1988. The Zoltar machine is *much *more realistic and plausible than that. (It is merely magic.)
Isn’t [hand-waving and assuming technology will catch up somehow] permitted in movies like that?
Yes but fortunately that was the only tarnish on the otherwise impeccable science of a movie in which a Zoltar machine turns a kid into an adult. 
Um? Depending on your interpretation of the “magic” at work, a full grown woman was having sex with a small child.:eek:
For me, the magic (and the south park excuse) make that hand waveable.