In Robert Bloch's original script, a wealthy socialite named Margo hired the Enterprise to look for Doctor Korby, whom she greatly admired. In his script re-writes, Gene Roddenberry felt the role would be better filled by Korby's wife or fiancée, which would play well with the doctor's alleged intimate relationship with Andrea and his emotional coldness. Finally, he wrote the part to feature Christine Chapel, who was previously featured in The Naked Time (1966) (and was played by Roddenberry's lover, Majel Barrett).
In any case, money is no longer widely used, certainly not by the Federation, so it is hard to see how someone could hire the Enterprise.
The replicator turntable appears on the infamous Star Trek Blooper Reel playing host to several drunken cast members using it for a Merry-Go-Round.
The only TOS episode to prominently feature Nurse Christine Chapel, who was played by Majel Barrett. Also featured is Ted Cassidy, best known for playing Lurch on The Addams Family (1964) TV series. Barrett would later play Star Trek: The Next Generation (1987)'s Lwaxana Troi, whose valet Mr. Homn was played by Carel Struycken, who played Lurch in The Addams Family (1991) and Addams Family Values (1993).
In an outtake from Bread and Circuses (1968), Ted Cassidy (Ruk) runs onto the set in his costume from The Thief from Outer Space (1966) and picks William Shatner up and carries him off camera.
Kirk's walk to the turbolift from his quarters is stock footage from The Man Trap (1966). He does not have in his hand the command packet he had retrieved from his safe a moment before.