One of the interesting tidbits about "Spock's Brain" is when McCoy uses the "teacher" device.
Seems to me this is a direct shout-out (rip-off?) of "Forbidden Planet." They had the same kind of teacher machine on Altair IV.
Basically and inverted spaghetti colander with wires coming out of it, I'll have to try it sometime.
Also, if it's considered silly to have an episode about a brain, then what about "Gamesters of Triskelion?" That has THREE brains, under glass.