- Blooper: Pinkie Pie temporarily becomes a pegasus◊ for a few seconds.
- Fandom Nod:
- The reality where Nightmare Moon rules Equestria has many of the trappings of the fan-created "New Lunar Republic". Or possibly a light-hearted Take That! given it's made clear she's a tyrant and there is no republic to be found.
- More than a few fans have compared the final Bad Future (a bleak, lifeless no-ponies' land) to the wastelands of Fallout: Equestria.
- I Knew It!: Starlight Glimmer's HeelFace Turn was guessed by quite a few, considering that her name rhymes with and is similar to Sunset Shimmer's, and that the preview season 5 cast poster had her next to Twilight and the others.
- It was believed by some fans that, even if the mane six never became friends and came to bear the Elements of Harmony, there would be other ponies who would potentially step up to take their place. While not destroying that theory, this episode shows that not all the problems could be solved, as in several of the timelines it seems others in Equestria were able to handle at least some of the villains.
- Several more cynical fans suspected the CMCs' cutie marks would be revealed to be part of Starlight's plan, with the status quo being restored for Season 6. Nope, they're here to stay.
- Some thought that Starlight didn't really believe in her philosophy of equality and just used it as a means to gain power. This episode shows that she did truly believe special talents would only lead to broken friendships and gave her a reason to think such.
- Spoiled by the Merchandise: An synopsis for an upcoming storybook that came up before the finale aired pretty much spoiled that Starlight Glimmer would pull a HeelFace Turn and be taken in as Twilight's pupil.
- Word of God:
- Episode writer Josh Haber cites the X-Men story, Days of Future Past, as inspiration for the two-parter's Time Travel plot.
- The house where Sunburst abandoned Starlight Glimmer "If I remember correctly, it was intended to be Starlight's."
Trivia / My Little Pony: Friendship Is Magic S5 E26 "The Cutie Re-Mark – Part 2"