^ Yeah, I noticed right away there was something...off about Kirk's torso. Seriously wtf.
IIRC, there was some kind of 'studio decency groupthink' in the mid 60's that required TV actors who appeared shirtless to have their chest hair shaved off. Shatner complied with the studio request but Leonard Nemoy would not. As a result there is at least one episode of TOS (
Patterns of Force, maybe?) where both of them appear shirtless- one of them hairy and one smooth.