TOS S03E13, S03E14, S03E15, S03E16, S03E17

In this installment:
(viewed April 4-7)

Star Trek: The Original Series, S03E13 - "Elaan of Troyius"
Star Trek: The Original Series, S03E14 - "Whom Gods Destroy"
Star Trek: The Original Series, S03E15 - "Let That Be Your Last Battlefield"
Star Trek: The Original Series, S03E16 - "The Mark of Gideon"
Star Trek: The Original Series, S03E17 - "That Which Survives"

"Elaan of Troyius"

• There are really only two notable things about this episode:  Some cool new CGI of the D7 class (especially in the closing battle with the Enterprise), and the crazy amounts of sexism just piled up all over the place.

"Whom Gods Destroy"

• Trek writers love to have one of the main characters, when introduced to an antagonist, say something about how so-and-so's exploits were "required reading" at Starfleet Academy (or something to that effect).  I believe this is the first time that's done, when Kirk is referring to former Starfleet captain Garth (it's possible that I missed an earlier employment of this narrative mechanism in an earlier TOS episode...but I don't think so).
• Apparently Kirk didn't include in his report the fact that Garth learned the secrets of cellular metamorphosis from those kindly folks on Antos IV (right before he tried to wipe them out).  'Cause otherwise, I have to assume that Section 31 would have had some agents with that capability--which in turn would have come in quite handy when the Federation was involved in a death struggle with a race of shapeshifters during the Dominion War.
• "Why can't I blow off just one of his ears?"
• Hot Kirk-on-Kirk action!  We'll get to see the rematch in The Undiscovered Country. 

"Let That Be Your Last Battlefield"

• This is, of course, Star Trek's early and groundbreaking--if somewhat clumsy--treatment of issues of race and enmity between peoples based on ethnicity.
• Bele, the man in pursuit of Lokai, is played by Frank Gorshin--better known to some as having played Riddler in the 1960s Batman television series.
  
  (Addendum:  My dad informs me that he was also a stand-up comedian who routinely appeared on programs like The Ed Sullivan Show and The Tonight Show Starring Johnny Carson.  My dad has particular memories of him doing an impression of Kirk Douglas.)
• The codes used to initiate the self-destruct sequence for the Enterprise in this episode are, if I recall correctly, identical to those used in The Search for Spock.
• In which the Enterprise plays crop-duster to an entire plant.
• Woops nuclear war LOL.
• "Shall I alert security, sir?"
  "Nah...f**k 'em."

"The Mark of Gideon"

• HEY WHERE DID EVERYBODY GO?
• Captains Log, Stardate...uh, whatever:  I've materialized on the Enterprise, but everybody else seems to be gone.  Except this hot blonde.  So, you know.  I'm going to work really hard to try and figure out what happened and get back.
• Odana's monologue about how horrible it is where she is from, crowded in on all sides by so many people, is pretty much exactly how I feel when I have to go into a shopping mall or department store :P
• So...no condoms on Gideon, then?
• It's always good news when Spock violates orders.
• "Your Excellency, please do not interfere. I already have one serious problem to resolve with upper echelons."  I love it when Spock is unintentionally funny.

"That Which Survives"

• "Mr. Sulu, if I'd wanted a Russian history lesson I'd have brought along Ensign Chekov."
• "Can you give me Warp 8?"
  "Aye, and maybe a wee bit more.  I'll sit on the warp engines myself and nurse them!"
  "That position, Mr. Scott, would not only be unavailing but also undignified."
  
  Again, unintentionally funny Spock is awesome.
• The planet-side story in this episode is a little like a Star Trek version of the show Ghost Hunters, complete with Sulu getting magnetic anomalies on his tricorder and McCoy picking up sudden, brief and powerful life-form readings on his.  I keep expecting one of them to say "Is there anybody here who wants to speak for us?"
• In addition to being unintentionally funny, Spock's also kind of a douche in this episode.  He spends most of his time in command of the Enterprise correcting people's estimates and telling them to shut up and get to work, pretty much.