You've touched on something. When I was reading the script I was trying to imagine the original cast (save for Drake and McKennah) saying the words. And that's where I felt certain words or phrasings were off. That said I did feel quite a bit of the script read like something the original cast would actually say."Scrap" sounds very early 20th century to me. It's definitely not a term that Deforest Kelley's McCoy would use a but it sounds sort of natural as something Larry Nemecek's character would say. To me, his character is world's apart from the McCoy we know, so I'm wondering if the script was written with him in mind? I also wonder if Chuck Huber would have used that term if he was cast instead.
The only time I've heard McCoy completely change his idiom was in "This Side of Paradise" when he's actually using an exaggerated Southern Drawl - those Mint Julips must have been effecting him.
Another thing that can throw me off just a bit is the pitch of the cast's voices. Nimoy had a depper voice than Haberkorn. Shatner's voice was also a bit deeper than Mignogna's. Chris Doohan's accent sometimes sounds a bit more exaggerated than his father's. Kim Singer's Uhura doesn't really sound anything like Nichelle Nichols' which is deeper, more resonant and more distinctive.
There's nothing you can really do about that because the original casts were really one of a kind.
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