Marvel's latest behind-the-scenes featurette doesn't give us much insight into Age of Ultron's plot or meta-textual themes, but it does make one thing clear: these movies were made by human beings who like to have fun. Not exactly a twist, but a sentiment that easily rubs off on the viewer.
And two TV spots full of quipping doesn't hurt either:
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Vox Video: Every Easter egg from the first Avengers- Age of Ultron trailers