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Retcons
The shape and position of the island of Kul Tiras was changed. In previous maps, Kul Tiras was located in or near Baradin Bay, was shaped more like a pear, was near Crestfall and Zul'Dare, and its absence in recent times was due to it having been shifted further into the sea by the Cataclysm.[22] Chronicle Volume 3 retroactively placed Kul Tiras near the Broken Isles even before the Cataclysm, and changed its shape drastically.[23] Its absence was due to internal conflicts and problems.
The chapter detailing with the orcs' lethargy and Antonidas's research about it was originally placed under Year 10.[24] Chronicle described it as Year 8.
The War of the Spider, previously established to be in Year 18,[24] was moved to Year 15.
In War of the Spider the nerubians are immune to both plague and telepathic domination. In Chronicle, it appears that they are saved from the plague through the efforts of their leader, Anub'arak.
Kel'Thuzad (the events of Road to Damnation) was previously called to the Lich King in Year 18.[24] Now, it is Year 15.
The events of Lord of the Clans, originally placed in Year 18,[24] are detailed under Year 15.
The events of Of Blood and Honor, originally placed in Year 19,[24] are detailed under Year 15.
The splintering of the Alliance of Lordaeron, originally placed in Year 19,[24] is detailed under Year 15. The splintering results in the revolt of Stormwind and the death of Tiffin (which was previously hinted to happen in Year 15 in Stormrage and The Comic) indicating that these three events described in Year 15 are not in a time skip.
The plagued grain was said to be distinguishable from normal grain.[25] Chronicle says it showed no sign of corruption and nobody saw any signs before days passed after consumption.[26][27]
The book establishes the order of Medivh's warnings as first to Terenas Menethil II, Antonidas and Thrall. In Warcraft III chronology, Medivh contacted Thrall first, then Terenas and Antonidas.
In Warcraft III, the place from which Thrall took ships and left for Kalimdor was the Alliance Naval Base near Southshore. Chronicle established the place was actually Southshore.
The Ultimate Visual Guides say that the new home of the Darkspear tribe was one isle and several isles. Chronicle states it was a string of isles.
In Arthas: Rise of the Lich King, when Uther was about to finish off Arthas, Frostmourne magically flew into the death knight's hand on its own, impaling the paladin and killing him. Volume 3 changed the circumstances of Arthas' victory slightly, saying that he instead recovered before Uther's last blow and struck at the paladin again and again until he killed him.[28]
The book says that Arthas and Ner'zhul fought because Arthas would not share the Lich King's powers. Ner'zhul had the initial advantage, but Arthas tore his mind apart by playing on his guilt in his role in orchestrating the Blood Curse. Ner'zhul remains, but is drowned in his own sorrow. In Arthas: Rise of the Lich King, Arthas simply killed Ner'zhul after also killing Matthias Lehner because he refused to be controlled again.
Previous lore stated that Sargeras burned arcane tattoos onto Illidan's skin.[29][30] Chronicle Volume 3 retconned them into fel tattoos.[31]
Arthas: Rise of the Lich King describes Arthas being teleported by Kel'Thuzad to Felwood, directly to the location of Illidan during the Legion invasion of Kalimdor. He was told about him by Kel'Thuzad as well. Chronicle says that Arthas went on Lich King's orders with the demons to invade Kalimdor. Before meeting Illidan, during the duration of time in Kalimdor, Arthas would secretly undermine the Legion efforts there. It also describes Arthas finding and manipulating Illidan on his own volition.
Before Chronicle, it was said that the druids empowered the World Tree with the night elves' immortality and the energies of countless night elf spirits.[32] Chronicle clarified that the druids ignited and drew out the World Tree enchantments. The wisps then emerged and channeled their energies into the World Tree and ignited the enchantments, causing the explosion.
The Warcraft Encyclopedia and the Ultimate Visual Guides stated that Lady Vashj and her naga joined Illidan because they remembered him from the War of the Ancients and respected his demonic power. Chronicle explicitly states that they did not respect his demon power and that they didn't join him because of their shared history but because the Old Gods willed it.
Warcraft III showed Illidan escaping from Lordaeron to Outland through a portal he opened somewhere in Silverpine Forest.[33] Chronicle established that he used the rift that Kel'Thuzad previously opened near Dalaran.
The book says that Theramore attracted Aegwynn whom Jaina Proudmoore asked to stay in the city. In Cycle of Hatred Jaina found Aegwynn living in a hut. Aegwynn acted like she didn't know about Theramore as she referred to it as "this Theramore place". When she later came to Theramore, she was actually moved there to recover after the battle with Zmodlor.
The Illidan novel states that Hellfire Citadel was raided by both the Alliance and the Horde. Chronicle only mentions the Horde raiding the wings of the Citadel.