Went back 5 pages and nothing there from you at all so I will ask again, please list some examples.
Oh, if it happens in every superhero movie like you said it should take you about 20 seconds to list just a few of them for me.
Kryptonian villiains in Superman.
Banner controlling Hulk at the end and Betty being separated from him.
Joker card at the end of BB, and Arkham immates on the loose.
Batman as a fugitive, with Gordon and him lying to everyone at the end of TDK.
Thor and Jane separated with the BiFrost destroyed. And Loki didn't die.
Captain America waking up 70 years later.
Well, all the post-credit scenes of Marvel movies are unfinished plots left for sequels.
And this is what i said about SM1 and SM2:
"...if a Spider-man movie ended with Harry swearing revenge against Spider-man, not knowing he's his best friend, Peter kissing MJ, who now suspects Peter is Spider-man, or Norman coming back from death and asking his son to avenge him. Nothing of which happened in the movies themselves but were to happen in the sequels."
and a long etc.
EDIT:
Oh, and Lord of teh Rings and Harry Potter movies.
Yes, both LOTR and ASM are trilogies. Trilogies don't solve everything in the first movie.