* AlternateAesopInterpretation: At first, it looked like this episode was steering towards the aesop "just because your friends don't want to play all the time doesn't mean they don't care about you anymore," or "sometimes real life takes precedence over partying." Her friends' evasions and excuses seemed perfectly sympathetic even before we knew they were planning a surprise party; many people, especially introverts like Twilight and Fluttershy, would not want to go to a big party the day after ''they just had one''. Plus, people do have to work and sleep at ''some'' point.
* ConfirmationBias: Pinkie's whole breakdown at the end of the episode is done entirely because of this; she interrogates ''Spike'', who has no idea what's going on, without explaining what this is all about to him, and eventually just ''tells'' him to tell her that her friends don't like her parties and don't want to be friends anymore. When Spike tells her this, just as she wanted, she takes this as definite proof.
* HarsherInHindsight: A rather infamous ''[=FiM=]'' fanfic ''Fanfic/CupcakesSergeantSprinkles'' features a psychotic Pinkie Pie mutilating and torturing Rainbow Dash to death, in horrific and gruesome ways. That doesn't happen in this episode, of course, but Rainbow Dash being alone in a room with a deranged and possibly violent Pinkie Pie made fans familiar with the fic feel more than a little uncomfortable.
** It should be noted that WordOfGod has said that all the Season 1 episodes were [[ProductionLeadTime written before the pilot even aired]]. Still a creepy coincidence, though.
* HilariousInHindsight:
** Some channels silence instances of "loser" during Pinkamena's birthday sequence, making it potentially sound like something much worse is being said. This is the exact tactic used for comedy in Jimmy Kimmel Live's "Unnecessary Censorship" bit, which may lead to some unintentional comedy when watching those versions.
** It turns out Fluttershy really ''is'' friends with a bear in "[[Recap/MyLittlePonyFriendshipIsMagicS2E3LessonZero Lesson Zero]]" (an episode also written by [=McCarthy=]), and we find out in "[[Recap/MyLittlePonyFriendshipIsMagicS5E15ScareMaster Scare Master]]" that the bear is actually called Harry. Harry's house/cave is also seen in "[[Recap/MyLittlePonyFriendshipIsMagicS3E3TooManyPinkiePies Too Many Pinkie Pies]]".
** Pinkie starts to pretend she has a rock friend, with a name and all? [[Recap/MyLittlePonyFriendshipIsMagicS4E18MaudPie She might have taken that idea from her older sister]].
* NightmareFuel: Pinkie Pie's SanitySlippage is a very unnerving sight. There's a reason that scene is considered one of the darkest moments in the series.
* OneSceneWonder: Pinkie Pie's "Pinkamena" personality hasn't been seen since this episode, only being alluded to here and there, but among the fandom she's easily a popular character in her own right.
* SugarWiki/SheReallyCanAct: Who knew Andrea Libman had such great acting chops for Pinkie here?
* TheWoobie: Pinkie Pie is so depressed her hair deflates. She is in serious need of a hug at the mid point.
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