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FullmetalRenkinjutsushi
Since: Dec, 2017
2024-11-14 07:25:21
Found it!
Innocuously Important Episode
https://tvtropes.org/pmwiki/pmwiki.php/Main/InnocuouslyImportantEpisode

I remember that the page quote is from someone who claimed that Ant Man fans were vindicated since it turns out Ant Man 2 is required to understand Endgame.
It isn't continuity lockout, as it doesn't have the quote that I mentioned above.
Edited by FullmetalRenkinjutsushi