io9.com posted a great article called Weird Secrets of The Avengers That You’d Never Have Guessed. Totally worth a read if you like this kind of behind the scenes info.
3. When the Hulk is smashing Loki up and down, they inserted Tom Hiddleston’s real agonized face.
This took a lot of shooting of Hiddleston looking pained, so they could paste it into the digital Loki. “We’re not inventing how he looks when he’s in pain,” says Chu. “I had to get behind [Tom Hiddleston] and shake him violently,” so they could capture his real expressions. (He mimes violent shaking.) “I did it so long, he started laughing. So we didn’t use that portion.” And for one brief shot where Loki is just hanging upside down, they still had to cut Loki’s face from somewhere else and stick it in, flipped the opposite direction.
X-Men: The (fan fic) Series 
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