Re: Should Simon Pegg cut off middle finger out of respect for canon?
Actually, as Scotty's hand was frequently played by actors other than Doohan (especially when in closeup); if Pegg chops off his finger he will be violating canon. And if he doesn't chop off his finger, as Scotty as also been clearly seen with nine fingers, he will be violating canon.
Scotty would be phasing in and out of the space-time canon!
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