Hey, I never noticed that before....

[The Salt Umpire]

And notice how immediately McCoy looked away, almost in sorrow.

And Trelane vaporized it. The Salt Vampire was made extinct twice.

NOOOOOOOOO!!!!

 

[Zombie Cheerleader]

^ Yes, like Crewman Commander posted…the bird creature from The Menagerie was also in the episode.

Thanks to TrekCore for this image!

And apparently an Ewok or a Muppet.

 

[Spock's Barber]

And apparently an Ewok or a Muppet.

^ The fuzzy thing mounted on a shield to the right looks suspiciously like the fur coat covering the little dog from The Enemy Within.