* AdaptationDisplacement: Those who saw the special first might not have heard of the book.
* AlternativeCharacterInterpretation: Was the Postman crying at the end because [[spoiler: he was defeated]] or were they TearsOfJoy? If you look below, one of his reasons for hating Christmas was being put on the naughty list, so it's possible that [[spoiler: he was touched that the penguins gave him a gift, even if it was raw fish]].
** Did Fido actually mishear Tim's words, or did he actually hear it just fine, but deliberately chose to lie? While it's true that it would be hard for either Olive or Fido to hear through the walls of the doghouse, it doesn't change the fact that Fido wasn't so far from it that he couldn't have at least made out what Tim was actually saying. However he knows that while Tim was certainly apologetic and that the issues between him and Olive could be resolved, he also knows that this won't change the fact that Santa will not be able to make his Christmas run without another reindeer...such as his good buddy Olive perhaps.
** As such, he decides to pull a rather cruel (albeit well intended) gambit by intentionally lying to Olive about Tim's words, and thus achieves two things: He ensures that Tim will have to truly understand how hurtful his earlier behavior was and thus truly appreciate Olive more, and Olive will be fully dedicated to try to get to the North Pole to help out as a replacement reindeer. The latter point also comes with the benefit of Olive coming to appreciate her time with Tim and Fido once her mission was complete. Granted this plan, if true, dips into Fridge Horror territory when you take into consideration the numerous ways it could have failed (Tim wasting his Christmas trying to find Olive, Olive potentially dying on her way to the North Pole and thus never making it, or even if she did make it deciding not to return to Tim out of pain from the "misheard comments"), thus highlighting how shortsighted such a plan was (although then again Fido IS a flea; long term thinking doesn't seem to be his strong suit). Fortunately due to this being a Christmas special, it all works out in the end.
* CrowningMomentOfHeartwarming: Not just Olive's story, but at the end, [[spoiler:the Postman receives a gift (some fish) from the penguins at the zoo. Despite the fact that the gift is pretty much useless to him, [[PetTheDog he seems genuinely touched by the gesture]]]].
* FridgeHorror: [[spoiler: So, is that mailman going to be trapped at the zoo, mistaken for a penguin and treated as such, unable to talk and tell people he isn't, for the rest of his life?]]
** [[KickTheSonOfABitch What, he didn't have it coming?]]
** [[EvenEvilHasStandards No one deserves raw fish.]] Except maybe real penguins...
* FridgeLogic: The Mondegreen which starts Olive on her journey was changed in the adaptation likely for this reason: It's a major ContrivedCoincidence everyone Olive heard singing happened to be on that particular line and seemingly stopped at that point, or she would have realized it wasn't about her.
* JerkassWoobie: The Postman. The reason he hates the Christmas season is because it greatly adds to his workload. People who have to consistently work during Christmas can probably sympathize with him. Although, it ''is'' implied that the true reason is because he's mad at Santa for putting him on the naughty list.
* MemeticMutation: "Bah, Bug and Hum" is modestly popular enough to spawn a few {{Fan Vid}}s featuring villains from other properties.
* {{Moe}}: Olive manages to be one '''and''' a strong character at the same time.
* RetroactiveRecognition: The special was animated by DNA Productions, who would later go on to create ''WesternAnimation/JimmyNeutron''.
* StrawmanHasAPoint: While the Postman is already a {{Jerkass}} whp went too far by trying to ruin Christmas for everyone, his dislike for the holiday still holds water. Since Christmas seasons greatly adds to his workload, but we the audience are supposed to root for Olive.
* TearJerker: The scene where Olive thinks that Tim is getting a new dog and replacing her (unbeknownst to her, he was apologizing for snapping at her).
* TheWoobie: Olive wants to save Christmas despite people, the weather, and bad luck impeding her quest. Viewers can't help but feel sorry for her when she almost feels like giving up.