Right after Kahn said, "explain it to them" and the torpedo is fired, we see McCoy, Carol, and David hanging out. It's only for a second--literally--and I always wondered where they were. Today I finally paused to look around, and there on the glass wall it says, "CDR. L. MC COY, M.D." I never saw that before! They were chilling out in Dr. McCoy's office...which I don't think we see before or again. (Possibly TMP but can't remember off the top of my head.) I must have seen this movie 100+ times and again keep finding things I never saw before. Coolness.