Because they approached the solar system from the outside. If Ceti Alpha VI was the outermost planet, its explosion would leave Ceti Alpha V as the outermost planet. They didn’t bother checking how many planets were between them and the sun.
Watch. On a naval vessel, you don’t work a shift, you stand a watch.
I don’t mind discussing things. I just object to flogging dead horses.
Sure. In this century. 
If you don’t want to talk about it then don’t talk about it, instead of telling us over and over that you don’t want to talk about it
Memory Alpha-Duty shift.
Yeah, that’s a weird comparison, because Luke and Leia being siblings isn’t a discontinuity in anyway. It’s generally assumed that their relation was a last minute ass-pull because, as genre-savvy viewers, we were able to recognize the textual cues that indicated they were setting up a romantic triangle between the three principle characters. But that comes from our understanding of film as artifice, and not, as you say, from within the four corners of the story. Luke and Leia being revealed as siblings contradicts our genre expectations, but not the internal logic of the story.
I guess it kind of highlights the way Chekov not being on the show in season one is also not a discontinuity, though, because the only way to know that is to know the original air date of the TV show, which is also not knowledge that exists within the story. If you gave all the TOS episodes to someone who had never seen the show, and told them to assemble them in chronological order, you wouldn’t get anything like the broadcast order, because the only internal clue about order (other than that one two parter) is the star date, and that shit is all over the map. If you go by star dates, Chekov *was *part of the bridge crew during season one, because a lot of season 2 episodes have earlier star dates than season 1 episodes.
[nerd hat on]
There are some moments that include elements from or references to earlier events:
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“I, Mudd” clearly takes place after “Mudd’s Women”
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“Where No Man Has Gone Before” is referenced more obliquely in “By Any Other Name” (Kirk says with some melancholy that they’d been to the edge of the galaxy before)
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The bluff from “The Corbomite Maneuver” is re-used in “The Deadly Years”
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George Samuel Kirk is referenced in the present tense in “What are Little Girls Made Of”, and is shown dead in “Operation: Annihilate!”
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The ship travels back in time to the 1960s accidentally in “Tomorrow is Yesterday”, on purpose in “Assignment Earth”
-others, I’m sure
[/nerd hat never comes off]
He also reminded Spock that he’d used his telepathic powers to trick the guard on Eminiar VII, a direct reference to “A Taste of Armageddon.”
50 Shades of Khan?
Well, he did whisk her off to Fantasy Island…
It was the 60s. Think Mad Men, if you weren’t there.
I just watched Who Mourns for Adonis tonight, and it’s even worse. Women were still weak, emotional creatures who screamed at the slightest hint of danger.
Marla and Carolyn would have gotten on great together. :o
Nitpick: “Adonais,” not “Adonis.”
Their fake eyelashes might get all tangled up together, though in the love scenes!
They probably figured it had been reclassified and there was no 9th planet anymore. #freepluto
Not *quite *what I had in mind … but yeah! :o
Well, both McGivers and Palamas were “soft science” types. Plenty of Starfleet women showed backbone in TOS.
Haha! Awesome! Thanks for sharing.
IIRC, soft science or not, it is elsewhere established or implied in Trek that everyone of rank has gone through Starfleet Academy whatever their job description. But hey, since when have they cared about consistency…
But yes, it is a 1966 show and 1966 mainstream attitudes will show up. Remember that the test audiences disliked the original Number One for being too bossy. And the very last episode alluded to a woman being excluded for being emotionally unstable (though it turns out she WAS, in fact).
The stereotypical “womanly” behaviors were more often seen among the guest players – Lt. Uhura meanwhile was a tough lady who could hold her own against Mirror Sulu.
In Space Seed we have in Marla someone who seems to be inclined in the direction of wanting an “alpha male” to take charge – which in turn through her specialty in history has led her to idealize an old time When Men Were Men (the way SHE sees it). However since she’s a competent researcher, that psychological trait would have likely been considered irrelevant to her posting and career because, heck, it’s a personal thing.
One could also imagine that someone like her, growing up in Future-Earth society, may only know of this kind of abusive relationship from once reading about it. That up until now her entire experience has been of her contemporaries completely respecting boundaries and agency and she’s entirely unprepared. Khan, OTOH, knows right away when he’s looking at someone who craves to be worthy of him and fears his rejection.
Which would just reiterate that Starfleet does things backasswards.
I think two of the planets in our own solar system do switch places… Neptune and Uranus, I think?