Episode Behind the Scenes


First appearance of Harcourt Fenton Mudd. He would return in "I, Mudd" as well as "Star Trek: The Animated Series" "Mudd's Passion". 
First appearance of Lieutenant John Farrell. He would later reappear in "The Enemy Within" and "Miri".
Writer Stephen Kandel wrote all three Harry Mudd episodes.
Gene Dynarski, who plays Ben Childress, would later play Krodak in "The Mark of Gideon" as well as Commander Orfill Quinteros in the "Star Trek: The Next Generation" episode "11001001".
Ruth's last name, Bonaventure, would later be the name of a ship lost in The Delta Triangle in "The Animated Series" episode "The Time Trap".
This episode would serve as the inspiration to "Star Trek: Enterprise" episode "Bound".
Even with the power on emergency batteries and no lithium crystals left the crew continues to use the transporter to get back and forth between the surface and the ship. This is likely because the writers hadn't dreamed up the ship having shuttle pods yet.