I don't want to get too far ahead of myself here, but I wonder: with Carter reelected, are the nuclear war movies of 1983 (think The Day After, WarGames, Testament, and Special Bulletin) still made? My guess is maybe not - after all, my understanding is that those movies were made amid the all-pervasive atmosphere of heightened tension between the US and the Soviet Union, to which OTL President Reagan's bellicose rhetoric (along with the Russians' paranoid reaction to it) was a major contributing factor. With Reagan butterflied away, perhaps things are less tense and those movies aren't made - but then again, maybe some of them still are.
Also, on a related note, does the "Petrov incident" of September 26, 1983 still happen? My guess is that it still does, given the fact that it was caused by the natural phenomenon of sunlight reflected off clouds being mistakenly recognized as a missile launch by the computer software in the bunker. I suppose the main difference would be that, amid a less tense relationship (if that is indeed true), the Russians would be more willing to admit that the system made a mistake, and thus the incident might well be known to the wider world right away, or at least within a month or two (in real life, it was unknown in the West until the late 90's, after the Soviet Union fell). At least, I think that would be true if the Korean airliner weren't shot down a few weeks prior (and such an event seems less likely if the Russians aren't as paranoid as they were in real life, which again was largely a reaction on their part to Reagan).
Anyway, those are my thoughts on the matter - I'd like to see what you think!