Trivia tidbits from the season finale of Star Trek: Discovery:
While at the Orion outpost on Qo'onos, we see:
(A) Two Ceti Eels being fried in a pan, along with some sort of three- or four-eyed fish. (I like to think it's a three-eyed fish in homage to The Simpsons.) We last saw Ceti Eels in The Wrath of Khan.
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(B) What appears to be two Ornithoid Lifeforms being stacked like lobsters and ready for eating. The image is unclear in a still. But the clawed tails of the Ornithoid Lifeform are very clear on camera as the bodies are being stacked and arranged. We last saw Ornithoid Lifeforms in the TOS episode "Catspaw". (They also appear in background images in TNG as some of the lifeforms children study aboard the Enterprise.)