I read that all of the sleeveless Wolverine shots are actually Hugh with green sleeves on and they CG'd the skin. Apparently he's had some skin cancer scares so didn't want to make it worse by filming in long hot days.
I'm happy that this seems to have paranoid political thriller vibes similar to The Winter Soldier. I was hoping that Secret Invasion would be more like this. I'm pretty excited for the next few MCU movies, though! I absolutely cannot wait to see Deadpool & Wolverine! That movie feels like something special that we almost didn't get, kinda like when Spider-Man joined the MCU in Civil War.