less an easteregg more of a funny writing coincidence.For me, it was Spider-Man's first appearance in Endgame, swinging under the bridge, which was a clear callback to the 1966 cartoon theme montage
the geographic location loki and thor have a chat in the forest might be the Odenwald(yep the neme of the forest means Odin's Forest/Wood
https://en.wikipedia.org/wiki/Odenwald