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Is there such a trope for this:
In a movie from Sony's Universe of Marvel Characters, one character (not a protagonist), suddenly makes a reference to an event from Avengers: Endgame (which probably hasn't happened in this continuity), and no-one In-Universe has any idea who the hell Thanos is, let alone "The Snap". Out-of-universe, it gets the reaction of "What the hell?".
Is there a trope for something like this?