The only false start for me in the film is whom they chose for Scotty, Simon Pegg. I like Pegg but I don't see him in the role. All that said, I am pretty certain he will hit a home run and own the role from here on out. However, Paul McGillion would have been pitch perfect. Watched him enough on SG-Atlantis to feel he could have easily handled it. What's odd is that his name appears on the IMDB cast log for the new film and it turns out he was in the running for the role. I wonder what happened there? IMO, all of the characters do look plausible as young versions of the TOS cast w. the exception of Scotty. You can draw your own conclusions on Doohan, Pegg, & McGillion's resemblance -