He said that, during filming, director Bryan Singer was confused by some of his acting choices.

Hugh said, “He said, ‘Are you sort of walking funny? What’s going on?’ And I said, ‘I’ve been doing this thing with wolves,’ and he goes, ‘You know you’re not a wolf, right?’

I said, ‘Well, there’s no such thing as a wolverine.’ [Bryan said,] ‘Go to the zoo, dude.’ I literally didn’t know it existed.’”