Board Thread:Questions and Answers/@comment-26999015-20160302045654/@comment-61022-20160302201934

Well even then, since it was a bonus feature of a previously released movie it's not considered canonical. Much in the same way a deleted scene or an alternate take in a movie is not generally considered "cannon" in a sequel. I can see the motivation of the "one shot" was a selling feature for Iron Man 3 and a marketing test to see if people were interested in something based on the Agent Carter character.