Robert Comsol wrote:
Good catch, the corridor is obviously wider on the port side (in contrast to this corridor's corner seen in "The Immunity Syndrome
"). Maybe there are some seating banks for waiting shuttlecraft passengers on the floor?
It could be anything. I took it as a corridor because Kirk,Spock, and McCoy enter through the A frame as if they were coming from the port side. (The camera was in the way.)