So The Deer Hunter does even better at the Oscars than it did in our timeline, which makes me wonder what will happen with Heaven's Gate.
Based on Moonraker's success, Spielberg's career is going even better than at this point in OTL. 1941 was seen as a disappointment both critically and at the box office. From what I've read, it seems like Spielberg thought he could do no wrong at that point in his career. He has said something to the effect that he believed his movies couldn't fail. It will be interesting to see how a longer streak of successes might affect his judgment ITTL.
I also have to wonder what Donner will do instead of Superman.
Heaven's Gate's failure has quite a lot of butterfly potential, but now I'm concerned about ending New Hollywood as in OTL and how this would relate to Lucas and Ford's career. I already have Lucas and Spielberg doing even better in OTL, so it seems like having Heaven's Gate be the unmitigated disaster it was OTL would be unfair to the premise of this TL.
1941 was really his only bad movie from this period as far as directing, so he won't really have much of a reason to check his ego TTL, since 1941 won't get made. Of course, Spielberg thinking he's the best won't really be far from true TTL, so by the time he has a humbling experience we'll already have some better films to show for it.
Donner's career will stay pretty much OTL post Superman for a while.
Speaking of Superman, prepare yourselves for a few years of serious superhero features and perhaps a role for Harry Ford in one of them...