If you watched Captain America: The Winter Soldier, you might not have understood the after-credits, and I am going to explain it. *Warning spoilers are ahead. If you have not seen the movie, go watch the movie first.*
The After Credits scene opens with Baron Von Strucker with the Tesseract Staff. In the comics, Strucker is the head of HYRDA when the Red Skull dies. He plays a larger role in many Captain America and HYRDA storylines, and I believe he is going to be in the Avengers, which would make sense because of the next big reveal in the After-Credits scene.
|Strucker from the comics|
|Johnson and Olsen on Age of Ultron set|
|Quicksilver and Scarlet Witch|
The final after-credits scene briefly shows the Winter Soldier (aka Bucky), going to the museum exhibit and seeing a picture of himself. It was not particularly crucial to the overall plot, but it is a nice ending that somewhat sets up for Captain America 3.
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