Companions
+ If Leliana dies during the Urn of Sacred Ashes quest, Dorothea has an agent take the form of a dead bard from Fereldan she knew because she's an identity no one recognizes.
+ If Wynne dies, Rhys is killed by Lambert and Adrian's plan still succeeds with him as a martyr.
+ The Warden and Leliana's relationship took a turn for the worst when she became an agent of the Divine but they met up for weeks of revelry and reknewal of their love on a regular basis right up until the Warden didn't show up mysteriously during their last rendevouz.
+ If Isabella isn't romanced and he's alive, she eventually renews her relationship with Zevran.
+ A romanced Sebastian eventually breaks his vows to love Hawke.
+ A non-romanced Sebastian eventually breaks his vows to love Bethany and joins the Mages' revolution.
+ If Sebastian is allowed to calm down, he doesn't raze Kirkwall if Anders lives but takes over Starkhaven and becomes a powerful ally of the Templars.
+ If Anders is killed, Sebastian takes over Starkhaven and becomes a powerful ally of the Mages.
+ Oghren's Approval score reset to 50 to the Warden due to some unconscious blaming of them for his failing to turn his life around as a Surface Dwarf and falling back into Old Habits.
+ King Alistair forgives the Warden for sparing Loghain by Awakening, mostly because he's the guy who sends Loghain to Orlais as punishment.
+ Drunk Alistair is a drunk less because of anger at the Warden than the realization, after the fact, he betrayed Duncan by not seeing the Blight through. He will attempt to rejoin the Order and beg the Wardens forgiveness after this.
Boons
+ The Circle of Fereldan Tower had freedom for a full year before the Chantry threatened and Exalted March and Irving submitted it back to their authority to prevent a war on Fereldan soil. This event, however, caused many mages to become radicalized and the core of the anti-Templar resistance.
+ Cullen actually did kill three-apprentices in a fit of PTSD induced paranoia. He was then imprisoned but was recruited back into the Templars by Meredith who was, even then, a hardass. Cullen eventually overcame his paranoia regarding mages and then realized he was surrounded by monsters.
His guilt over this event drives him to this day.
+ The Dalish settlement of the Hinterlands failed due to the fact other Dalish didn't trust King Alistair and while there's still a community in the Hinterlands and it's used as a common meeting ground, almost no Dalish consider it "their" territory.
+ The Bann of the Alienage is viewed as better than the Teyrn of Gwaren because City Elves really can't quite believe in the later. Even if the latter is mostly devastated Darkspawn ruin anyway.
NPCs
+ Anora is freed by King Alistair after a year's time if not Queen and given a Bann position as well as stipend in her father's former holdings. Annoyingly, she marries up almost immediately and becomes the new Arlessa of Denerim. If Vaugn is still alive, he falls down a flight of stairs on their honeymoon.