I've read a book once quoting an insider that Coon wrote this script as a deliberate FU to Fred Freiberger. It's been years since I read this, and I don't remember exactly what publication I read it in though, so I can't speak for its veracity.
The whole idea of the remote control Spock was apparently a late addition to the script. It does not appear in James Blish's adaptation. Probably Nimoy realized he wasn't getting enough screen time.
The whole idea of the remote control Spock was apparently a late addition to the script. It does not appear in James Blish's adaptation. Probably Nimoy realized he wasn't getting enough screen time.