There were a surprising number of people in my audience that stayed until the very end of the credits, expecting some easter eggs, only to verbally express their dismay at there being nothing else to see. The Marvel movies have apparently set a high bar for "valued-added" extras.
"The trouble with being a ghost writer or artist is that you must remain anonymous without credit.
If one wants the credit, one has to cease being a ghost and become a leader or innovator."
Bob Kane