History Foreshadowing / HarryPotterAndTheOrderOfThePhoenix

* "I heard... that awful boy... telling ''her'' about them, years ago." Harry assumes she's taking about his father and snaps at her. [[spoiler:That's not Aunt Petunia referring to James and Lily. She's referring to ''Severus Snape'', who is revealed in the final book to have been living in Petunia and Lily's neighbourhood and had been friends with Lily long before she met James.]]

* In the ''Hog's Head'' inn Harry notices that the bartender looks "vaguely familiar". [[spoiler:It's Dumbledore's brother Aberforth.]]

* At Grimmauld Place, [[spoiler:the locket found in the drawing room]] has great significance in Book 7.

* Whilst Sirius and Harry are examining the Black family tree, they come across Phineas Nigellus Black. Sirius states that "[he's the] least popular Headmaster Hogwarts ever had". Later in this book, that title will go to Dolores Jane Umbridge.

* A multi-layered example with the Howler Petunia receives at the beginning warning her to "remember my last." The ending reveals it was sent by [[spoiler:Dumbledore]] and is referring to a previous letter, the one [[spoiler:he gave her when he left Harry on her doorstep in the first chapter of the series, explaining why he was doing so.]] However, the reference to the "last" letter implies there were others as well, and we find out in ''Deathly Hallows'' that [[spoiler:Dumbledore previously sent Petunia a letter when she was a child, politely declining her request to come to Hogwarts with Lily.]]

** Looking back at this quote, it can also be seen as foreshadowing to [[spoiler:Naricssa successfully straight-up lying to Voldemort about Harry being dead]] in ''Deathly Hallows''.

* The memory of Snape's that Harry watches has the younger Snape use some spell that leads to a slash appearing on James' cheek, like he was cut with a knife. [[spoiler:That's ''Sectumsempra'', a spell that doesn't get named until the next book, and is revealed to have been somewhat of a signature spell of Snape's.]]

* "I heard... that awful boy... telling ''her'' about them, years ago." Harry assumes she's taking about his father and snaps at her.[[spoiler:That's not Aunt Petunia referring to James and Lily. She's referring to ''Severus Snape'', who is revealed in the final book to have been living in Petunia and Lily's neighbourhood and had been friends with Lily long before she met James.]]

* "I heard... that awful boy... telling ''her'' about them, years ago." [[spoiler:That's not Aunt Petunia referring to James and Lily. She's referring to ''Severus Snape'', who is revealed in the final book to have been friends with Lily long before she met James.]]

* Ginny is more present in this book than in the previous four combined, and often makes Cho look bad. It's Ginny's idea of "Dumbledore's Army" that is used, instead of Cho's more generic "Defense Association." [[BroodingBoyGentleGirl Ginny is usually the one who snaps Harry out of his numerous funks]] over the course of the book, including when he's convinced he's being possessed by Voldemort. She ''has'' been possessed by him, and could have told Harry exactly what it felt like, if he had bothered to ask. And the tender scene in the library as Harry and Ginny share Easter eggs together. And the line "Ginny got the Snitch right out from under [Cho's] nose." Could it be more obvious? ''Especially'' the Easter [[BabiesEverAfter eggs]] scene?

* Ron and Hermione's [[BelligerentSexualTension bickering]] strongly reminds Harry of Molly and Arthur Weasley's bickering at one point. Molly and Arthur ''are'' an old married couple. [[spoiler: Come the epilogue of Book 7...]]

* Whilst Sirius and Harry are examining the Black family tree, they come across Phineas Nigellus Black. Sirius states "[he's the] least popular Headmaster Hogwarts ever had". In Book 5, that title will go to Dolores Jane Umbridge.

* At Grimmauld Place, amid a Doxy infestation, Molly is noted to have consulted "Gilderoy Lockhart's Guide to Household Pests". Lockhart later makes his first appearance in the series since [[Literature/HarryPotterAndTheChamberOfSecrets Chamber of Secrets]] when the trio visit St. Mungo's and it is revealed he is writing his final book "Who Am I?".

* Sirius's baby brother is named Regulus, following the StellarThemeNaming used by the Black Family. More precisely, he's named after [[spoiler: the most prominent star in the Leo Constellation, also called Cor Leonis, ''the lion's heart''. Now, what do we learn about why he died in Book 7?]]

* Snape, when talking to Harry about Legilimency: "The Dark Lord, for instance, almost always knows when somebody is lying to him." [[spoiler: He says "almost" because Snape is the one who (for a while at least) manages to get away with lying to Voldemort in the final two installments.]]

* The full prophecy's final line: [[spoiler:Neither can live while the other survives]] is misinterpreted by both Harry and [[spoiler:deliberately falsified by]] Dumbledore, as meaning one must kill the other. [[spoiler:It's actually a subtle foreshadowing of the fact that contained within Harry is a piece of Voldemort's soul, and he remains tied to Voldemort as a Horcrux.]]
* Early on Nearly-Headless Nick claims to have "never been guilty of cowardice in [his] life!" At the end [[spoiler: he reveals that the reason he's a ghost is because he was afraid of death.]]
* Whilst Sirius and Harry are examining the Black family tree, they come across Phineas Nigellus Black. Sirius states: "[he's the] least popular Headmaster Hogwarts ever had". In less than a year that title will go to Dolores Jane Umbridge.

* At one point, Phineas Nigellus Black tells Harry that the Slytherins can be brave, but don't go headlong into danger like the Gryffindors--they were more likely to retreat and come back with help. This foretells the climax of not only this book ([[spoiler:Harry rushes headlong into danger, a mistake that results in the death of his godfather]]), but also the climax of the seventh book ([[spoiler:Professor Slughorn leaves with the evacuating students, including the rest of the Slytherins, but returns later with reinforcements in the form of the students' parents and the citizens of Hogsmeade, later going up against Voldemort himself. WordOfGod is that some of the Slytherin students also returned with Slughorn, also with reinforcements]]).

* Ginny is more present in this book than in the previous four combined, and often makes Cho look bad. It's Ginny's idea of "Dumbledore's Army" that is used, instead of Cho's more generic "Defense Association" and [[BroodingBoyGentleGirl she is usually the one who snaps Harry out of his numerous funks]] over the course of the book, including when he's convinced he's being possessed by Voldemort. She ''has'' been possessed by him, and could have told Harry exactly what it felt like, if he had bothered to ask. And the tender scene in the library as the two share Easter eggs together. And the line "Ginny got the Snitch right out from under [Cho's] nose" Could it be more obvious? ''Especially'' the Easter [[BabiesEverAfter eggs]] scene?

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* Ginny is more present in this book than in the previous four combined, and often makes Cho look bad. It's Ginny's idea of "Dumbledore's Army" that is used, instead of Cho's more generic "Defense Association" and she's usually the one who snaps Harry out of his numerous funks over the course of the book, including when he's convinced he's being possessed by Voldemort. She ''has'' been possessed by him, and could have told Harry exactly what it felt like, if he'd bothered to ask. And the tender scene in the library as the two share candy together. And the line "Ginny got the Snitch right out from under [Cho's] nose" Could it be more obvious?
* Neville also begins to show signs of life as well; notably, he's still fighting when all the other kids, who are notably better wizards than him, have already been defeated. Unfortunately, this just shows the danger in relying on FridgeBrilliance[[invoked]]: Rowling did it all so subtly that a lot of people missed it.