I just rewatched the Cage and noticed something I don't remember seeing before.
When they first beam down and approach the singing plants Nimoy appears to be limping heavily in that scene.
It is my imagination or had he injured himself in some way?
Spock had been injured (presumably) recently on Rigel VII. ("Three people killed--including Pike's yeoman, and seven injured.") Other notable injuries include Jose Tyler (who has his hand bandaged) and the unnamed geologist (who has a bandage on his neck).