I recently attended a lecture about transmedia franchising, in which the lecturer remarked:
Marvel are a company who never pass up a self-referential opportunity, no matter how obscure.
Whilst I'm aware that this was largely intended to be hyberbolic, the context of the discussion was engaged with explaining how different Marvel properties will signal fans by placing easter eggs in the work, even if it references a property that the work doesn't directly own/benefit from.
Given that Thor: The Dark World has long sequences set in England, I wondered if there was any reference to Excalibur featured within it?
I also posted this question which seemed to demonstrate some obscure (and as yet unidentified) reference, could the two be linked?