Back in the days before everyone knew to stick around through the credits of a superhero movie for an extra scene, Samuel L. Jackson showing up at the end of Iron Man was nothing more than an Easter egg, a joke for the faithful. It was no different than the time George Clooney’s Batman wisecracked that disobedient sidekicks were the reason Superman works alone (a thing that actually happened in a real movie). Feige changed that. – Wired
It’s a pity DC isn’t able to do what Marvel can.