In the fight scene between Mystic and Wolverine, watch the steel cage door when Mystic uses it to hit Wolverine. It bounces off of him and makes it shake likes it's made out of rubber.
For one thing, its Mystique, and have you ever run into one of those fences? they shake, as most things do if you chuck it at something. I dare say it wouldn't have been the real thing, do you really think they would throw metal at Hugh Jackman or a stunt double. But that isn't a stuff up.
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