During the Credits
There is an extra scene during the credits of Captain America: The Winter Soldier that follows two minutes of animated silhouettes of characters and objects from the movie. See below for details on the stinger.
Baron Von Strucker (Thomas Kretschmann) is shown in his underground lab after the fall of both S.H.I.E.L.D. and HYDRA. Baron is shown to have possession of Loki’s scepter, as well as two trapped prisoners. The prisoner on the left exhibits superhuman speed and is Quicksilver (Aaron Taylor-Johnson), while the prisoner on the right has telekinetic powers and is the Scarlet Witch (Elizabeth Olsen). All three of these characters are set to appear in the upcoming Marvel sequel, Avengers: Age of Ultron. Von Strucker proclaims that “The Age of Miracles” is near and seemingly hints at the future of how mutants will be used in the Marvel Cinematic Universe. As predicted, this extra scene was included by Marvel in a rush to get their version of Quicksilver on screen before 20th Century Fox puts their own version in the upcoming X-Men: Days of Future Past.
There are no extras during the remaining five minutes of the credits.
After the Credits
There is also another extra scene after the credits of Captain America: The Winter Soldier. See below for details on the stinger.
In the extra scene after the credits of Captain America: The Winter Soldier, the Winter Soldier is shown incognito at the Smithsonian Institution. As he stands in front of and reads the information about James “Bucky” Barnes in the Captain America exhibit, the Winter Soldier seemingly realizes that Rogers had told him the truth about his old identity.
After the half-minute stinger, there is a title that reads, “CAPTAIN AMERICA WILL RETURN IN AVENGERS: AGE OF ULTRON”.