* GrowingTheBeard: Around the time of Part Twenty-Two, the series, though still side-splittingly funny and romantic, takes a much more serious tone, especially when dealing with Voldemort's rise and [[spoiler:the death of James' parents]].
* SugarWiki/HeartwarmingMoments: The dancing lilies. Part 23 in general.
* HarsherInHindsight:
** After the [[spoiler:death of James' parents]], Lily quietly asks how long it will be until it's one of them that gets killed.
** "Anyway, he can't work a defensive spell if his life depended on it, which it would. You know how he gets when his blood's up, all laughing and insane and hopping about talking nonsense and all of a sudden someone would hit him in the chest with a hex before the possibility even occurred to him." - From Part 25, from James about Sirius as to why Sirius shouldn't fight Death Eaters alone. Also counts as a TearJerker.
** Remus teases Sirius about his seeing "draperies" in his crystal ball during divination class and jokes about his friend's future in bridal couture, to which Sirius corrects him by saying they're actually [[spoiler:''veils'']].
** Sirius jokingly remarks that Remus will outlive all of the Marauders.
** From the Halloween installment: [[spoiler:Remus is "well aware that he is the sidekick with the books who hangs about in the back being a good influence with a posh accent and then is killed tragically just before the climax."]] Written years before the last book came out, no less.
** At one point, Peter notes that Sirius would get him killed.
* HoYay:
** James and Sirius' hero-worship of the Prewett Brothers reeks of this, to the extent that Sirius seriously considered wearing a pink shirt reading 'Mrs. Fabian Prewett' in public.
** The spells Dumbledore casts in part 16 to make the school act out a horror movie invokes this in the Slytherin girls.
** Sirius and Remus are very touchy-feely before it becomes clear that they're an item.
* MemeticMutation: "I do believe in commas. I do, I do."
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