Avengers: Age Of Ultron - 15 Obscure Easter Eggs You Probably Missed

While Aaron Taylor-Johnson and Elizabeth Olsen weren't subjected to the incestuous dynamic that was introduced in the Ultimates comics, the actors made sure they referenced all aspects of the characters. 

According to Olsen, while there was no overt realisation of that side of their relationship, she and her on-screen brother "played around" with certain parts of it: 

"Every time you see an image of them, they're always holding each other's hand and looking over each other's shoulder. They're always so close, it's almost uncomfortable. Aaron and I have been playing a little bit with those kinds of images just for ourselves."

You can certainly feel an uneasy closeness between them.