You have chosen wisely on all counts.
i do however have one serious problem with virtually all your (correct) choices: ss this is the era that spawned “the sequel” which has essentially ruined modern movies.
Rocky 1 was unbelievably good, something we forget by the time rocky 4 and beyond come around.
Alien was fantastic and was followed up by the also fantastic aliens…. But by the time ripley is cloned with alien blood we forget that greatness.
Jaws was a fantastic, if not factually flawed, story that gave life to everyones fears of the unknown in the ocean…. By the end of jaws two when he feeds the shark a power cable nobody can take it seriously, to speak nothing of the all time lows found in “jaws the revenge”
the godfather one and two are still cinematic masterpieces that are beloved and quoted as often as often any other movies… but also spawned godfather 3
halloween? Please. Self explanatory.
and of course, both the greatest and most heartbreaking of all, Starwars. We go from ben kenobi sacrificing himself, Vader being the most badass to ever badass and luke blowing the death star to f***ing ewoks defeating the empire with rocks. F***ing. Ewoks.
i look back at those great movies and rewatch them even now with fondness, but there is always a tinge of sadness knowing what they spawned.