Most unrealistic part of the movie, and by god I'm including TIME TRAVEL, is that Scotty would be both dismissive of and insanely good at keyboarding text entry and use of a 1980s computer. Either he'd be pissed off because because there was no way to use this antique, or he'd be delighted at the chance to use his historical reenactment skills.
I think Star Trek 5 was my third theater experience. Grandmother took me which is weird bc I don't remember her watching, but my mom was obsessed with ST:TNG. But I remember IV being on TV back then.