What Marvel Easter Eggs in the latest phase hint future plotlines?

[BrianYW]

I just rewatched the latest Marvel movie and caught a background prop that looks like a direct reference to a much older comic book storyline, not just the usual cameo or post-credit scene. It got me thinking about the deeper lore they're weaving in. For hardcore Marvel comics fans, what are some of the most obscure or cleverly hidden Easter eggs you've spotted in the recent phase of films and shows that hint at future plotlines or pay homage to niche comic arcs most viewers might miss?