Plot Hole: You can find quite a lot of inconsistencies if you nitpick.
Why did the Elements of Harmony first banish Luna but then turn her back to normal, and why did they turn Discord to stone instead of banishing him or turning him good?
Luna was imprisoned by negative qualities, which weren't actually hers, plus Celestia knew she wanted to banish Luna when she used the elements, and Discord is pure chaos, nothing can turn him harmonious except Fluttershy.
Why did Twilight never mention her brother to anyone until the wedding?
Where exactly did alicorns come from?
Where are Celstia's and Luna's parents, or do they even still have parents?
Why did Twilight forget Celestia and Luna were sisters in, 'Friendship is magic part 2,' when she read the book that clearly stated that they were sisters?
If Rarity is the Element of Generosity, then why is she so selfish?
She would willingly give it all up for her friends, or famous ponies, but not strangers.
Why is Fluttershy the Element of Kindness when she is so shy and antisocial? Shouldn't that go to Pinkie Pie since she's friends with everyone in town?
Fluttershy is kind to everyone too, and Pinkie is too random and pranky to be kindness.
What really was the point of Celestia only sending two tickets at the beginning if she was just gonna send extra tickets in the end of "Ticket Master"?
Successfully pulling off what Twilight tried to do in "Lesson Zero"
The first invitation with its two tickets was the generic formal type; Celestia likely didn't even write it herself, she has ponies for that. She really only realized there was a problem at all when Twilight wrote back.
If Twilight has the ability to stop Rainbow Dash, then why didn't she use it in "Return of Harmony part 2"?
Probably too small and too far away at that point. And the Ursa was a stationary, sleeping target.
What has Luna been doing for the past two seasons that made her only show up three times?
Sleeps during the day.
Is it, "pony, everypony, somepony, and nopony," "people, everybody, somebody, and nobody," or is it a mixture?
Why was it Twilight who threw the party in "Look Before you Sleep," and also why was she so slow-witted enough to let a tree fall on her and not freak out?
She was trying to experience something she couldn't do before because she was antisocial, and she did freak out, she just did it OCD style. That and she probably got a concussion.
Because Pinkie Pie is friends with every pony in town, and Fluttershy has few.
In "Putting your Hoof Down", when Fluttershy asked two garbage carrier ponies to move out of the way, but why didn't she just fly over them?
She isn't very good at flying, and when she does fly, it's for her friends or animals.
In "A Canterlot Wedding part 1" Twilight completely forgets the lesson she learned in "Lesson Zero" (which was not freak out over small things), and flips out when Candance acts rude to everyone. Twilight then accuses her of being evil though technically Twilight was right, but still she forgot a lesson.
Her friends and even Celestia herself forget the second lesson, which is don't dismiss a problem no matter how small.
Six words: "Time passing by" and "wedding made right". Between Lesson Zero and this episode, 23 passed between them (aka. an undefined period of time), so they would've need a very good memory to remember that, especially since (as Queen Chrysalis points out in part 2) they were more preoccupied with doing the wedding right. Additionally, Twilight already showed exaggerated preoccupation toward her brother at the beginning of part 1, so it is no wonder her friends shrugged off later preoccupations as Twilight just exaggerating things.
In the beginning of "The Crystal Empire, Part 1" she still hasn't recalled that lesson.
Also not recognizing the ladybug chant, which was a prominent memory for both Twilight and Real!Cadance.
Why didn't they just blast King Sombra with the Elements of Harmony (which possess the power to defeat the far stronger Discord in one shot) and call it a day? Along with sufficient preparation time, the heroines even had easy access to them for once.
While told about King Sombra, they didn't think that he was an active threat once more.
Removed, take it to Headscratchers:
- Plot Hole: You can find quite a lot of inconsistencies if you nitpick.
- Why did the Elements of Harmony first banish Luna but then turn her back to normal, and why did they turn Discord to stone instead of banishing him or turning him good?
- Luna was imprisoned by negative qualities, which weren't actually hers, plus Celestia knew she wanted to banish Luna when she used the elements, and Discord is pure chaos, nothing can turn him harmonious except Fluttershy.
- Why did Twilight never mention her brother to anyone until the wedding?
- Where exactly did alicorns come from?
- Where are Celstia's and Luna's parents, or do they even still have parents?
- Why did Twilight forget Celestia and Luna were sisters in, 'Friendship is magic part 2,' when she read the book that clearly stated that they were sisters?
- If Rarity is the Element of Generosity, then why is she so selfish?
- She would willingly give it all up for her friends, or famous ponies, but not strangers.
- Why is Fluttershy the Element of Kindness when she is so shy and antisocial? Shouldn't that go to Pinkie Pie since she's friends with everyone in town?
- Fluttershy is kind to everyone too, and Pinkie is too random and pranky to be kindness.
- What really was the point of Celestia only sending two tickets at the beginning if she was just gonna send extra tickets in the end of "Ticket Master"?
- Successfully pulling off what Twilight tried to do in "Lesson Zero"
- The first invitation with its two tickets was the generic formal type; Celestia likely didn't even write it herself, she has ponies for that. She really only realized there was a problem at all when Twilight wrote back.
- If Twilight has the ability to stop Rainbow Dash, then why didn't she use it in "Return of Harmony part 2"?
- If Twilight has the ability to lift an Ursa Minor, then why did she not stop Rarity from falling in "Sonic Rainboom"?
- Probably too small and too far away at that point. And the Ursa was a stationary, sleeping target.
- What has Luna been doing for the past two seasons that made her only show up three times?
- Sleeps during the day.
- Is it, "pony, everypony, somepony, and nopony," "people, everybody, somebody, and nobody," or is it a mixture?
- Why was it Twilight who threw the party in "Look Before you Sleep," and also why was she so slow-witted enough to let a tree fall on her and not freak out?
- She was trying to experience something she couldn't do before because she was antisocial, and she did freak out, she just did it OCD style. That and she probably got a concussion.
- Why didn't Pinkie explain herself better in "Swarm of the Century"?
- Well it is Pinkie Pie we're talking about. What else would you expect?
- Also, nopony would give her any time.
- Why is it Pinkie Pie they told Fluttershy to stand up for herself in "Putting your Hoof Down," but then made her carry all her stuff in "It's About Time"?
- Maybe Fluttershy was feeling sorry for what she did to them prior (making them cry).
- If Rainbow Dash is the only Pony/Pegasus to ever pull off a Sonic Rainboom, then why does she not have more recognition?
- Because every time she did it, she was under extreme pressure; she fails every time in a relaxed state.
- Why is it in the town of Ponyville everyone was kind and cheerful in "A Friend in deed" but rude in "Putting your Hoof Down"?
- Because Pinkie Pie is friends with every pony in town, and Fluttershy has few.
- In "Putting your Hoof Down", when Fluttershy asked two garbage carrier ponies to move out of the way, but why didn't she just fly over them?
- She isn't very good at flying, and when she does fly, it's for her friends or animals.
- In "A Canterlot Wedding part 1" Twilight completely forgets the lesson she learned in "Lesson Zero" (which was not freak out over small things), and flips out when Candance acts rude to everyone. Twilight then accuses her of being evil though technically Twilight was right, but still she forgot a lesson.
- Her friends and even Celestia herself forget the second lesson, which is don't dismiss a problem no matter how small.
- Six words: "Time passing by" and "wedding made right". Between Lesson Zero and this episode, 23 passed between them (aka. an undefined period of time), so they would've need a very good memory to remember that, especially since (as Queen Chrysalis points out in part 2) they were more preoccupied with doing the wedding right. Additionally, Twilight already showed exaggerated preoccupation toward her brother at the beginning of part 1, so it is no wonder her friends shrugged off later preoccupations as Twilight just exaggerating things.
- In the beginning of "The Crystal Empire, Part 1" she still hasn't recalled that lesson.
- Also not recognizing the ladybug chant, which was a prominent memory for both Twilight and Real!Cadance.
- Why didn't they just blast King Sombra with the Elements of Harmony (which possess the power to defeat the far stronger Discord in one shot) and call it a day? Along with sufficient preparation time, the heroines even had easy access to them for once.
- While told about King Sombra, they didn't think that he was an active threat once more.
Long live Marxism-Lennonism!