The cast was one of the best things about the JJ Star Trek movies. I was surprised that the cast came across as engaging as they did. I had my doubts in the beginning, that some actors could credibly fill the shoes of the original TOS cast. I especially thought that Pine, Quinto and Saldana did very good portrayals (or versions) of Kirk, Spock and Uhura, respectively. I even liked the Spock/Uhura romance.
If that was the case about STID, I am curious if Spock's "KHAAAANNNN!!" scene was always part of the script, from the beginning, or if it was added after JJ or TPTB decided to go with Khan as the villain. Because if that scene had always been there from the outset, I can only imagine how awkward it would have been for Spock to have screamed "ERICKSONNNNN!!" or "HARRISONNNNNN!!"
Even though Spock's "KHAAAANNNN!!" was a ripoff from TWOK, at least the viewer would have been able to understand the context of the scene. But if Spock had shouted "ERICKSONNNNN!!" or "HARRISONNNNN!!", I don't know how it would have been perceived by viewers in that different context, not to mention how clunky it might have sounded.