The scene where Graham cheers up Whisper after losing badly at the Duel of Speed. From a story perspective, he didn't have to do that. He could have just rubbed it in his face that he won. Instead, he gives Whisper what he wants: a fan.
And when you ask Whisper to help catch a frog, Whisper happily does it and says "Anything for a ffaaaannnnrrrrriiiiieeeeennnnddd."
Acorn's love of Princess Madeline of Avalon, a squirrel who he keeps under his belly. When asked if she's his pet, he insists "She's my friend."
Achaka's bonding with Graham. Despite having no common language and Achaka at first believing Graham just an annoying tagalong by his body language alone, the pair slowly gain mutual respect, with Achaka relying on Graham to get him out of a locked cell that he cannot escape and Graham being coached by Achaka on how to properly use a bow. Achaka helps boost Graham over a wall without hesitation and, after Graham makes his first proper shot thanks to Achaka and swings across a chasm, Achaka joins him and gives him a friendly punch in the shoulder, with Graham smiling at him. Depending on if you went to get Hornswoggles eye first or handled one of the other challenges first, Graham (who was sent to get Achaka's signature as a forfeit of the challenge, since Achaka had not brought an eye in time) suggests that they could find an addendum that would keep Achaka in the competition. It makes his death shortly after all the more heartbreaking.
The scene after the Duel of Strength. After Manny manipulated the guards into ridiculing Acorn over the hand knitted sock he made (and what a jerk Acorn had been so far), Graham instead returns the sock to him and apologizes for what happened. When Acorn admits that he would prefer to make arts and crafts, but he was pushed to be a knight because he was big, Graham supports him. From that moment on, Acorn happily supports Graham and helps with anything he asks, even gifting him a pair of his handmade socks.
Potentially the Compassion choice with the Dragon during the prologue. After all Graham went through, instead of taking down the enemy who murdered his friend five years ago, he instead shows it mercy and sets it free as a gesture of good will and forgiveness. That is the sign of a true hero!
When the chain breaks, even Hornswoggle seems surprised at this turn of events, staring at Graham for a moment before retreating.
"In that moment, I forgave the dragon for his atrocious past."
Chapter 2:
When you find the Merchant of Miracles, if you saved him in the previous chapter, he'll be very happy to see you. Nice to see he's not a complete Ungrateful Bastard.
Graham saves a Goblin(really a human who had been raised as a goblin)from some goblins bullying him. Graham uses a light and a baby dragon to scare his tormentors off. The man, in thanks, helps him cross the chasm using a bridge. The man is revealed to be Mordack, who later pulls a Heel–Face Turn and saves Graham, betraying Manny when he remembers this event.
Right before starting to cross the chasm, Graham does Achaka's salute.
The thing that makes Muriel lose her temper and decide to ditch the smart way and rain hell upon their guards? The Goblins laugh at Chester's poor memory after he accidentally adds the wrong ingredient to the potion. Likewise, Wente getting so riled up over his wife's poor treatment that he's willing to ditch the compassionate way as well.
The Compassion choice ending.
Chapter 3:
Graham's relationship with Neese if you romance her. Particularly in a Compassion Route, she's every bit the dork that Graham is.
Subsequently, the reaction Neese has when Gwendolyn gives her the perfect gift: a new lute. She's just so touched!
Chester and Muriel on vacation in Tanalore when Vee and Graham are sent there. The pairs relationship is just so sweet. And Muriel gives Vee her blessing, even if she isn't the princess you romance.
Chester: I am SO glad you are my person. (Embraces Muriel)
Graham and Vee clearly having a good time trying to out-pun each other.
They still do when they're both old and grey, and Graham is sickly in bed.
Valanice/Vee: Sometimes you've got to keep going until you pancake no more!
Gwendolyn's gift for Vee is a puzzle box which doubles as a music box with an hourglass in it. It seemed like the first time Vee was at a loss of words.
In the climax, Princess Valanice, the princess you pick, comes back to save the other princess, right after she thought she'd made a heroic sacrifice to save her.
The barrier keeping everyone in the tower could only be broken through "true love". Because Valanice and her friend love each other like sisters, they're able to get through the barrier together.
Hagatha was a pretty 2D villainess in King's Quest II. Here it's shown she was locked away by her own parents, and kept waiting for her true love to free her. It never came, and she stopped loving herself. Graham is the first person who shows her empathy, and when she can't exit the tower, he walks out with her. Hagatha smiles to see Graham with his chosen princess before she walks off to find herself.
Chapter 4:
The lullaby Graham sings to baby Alexander.
The entire chapter shows just how proud Graham is to be a father.
In the present, Alexander has retired from adventuring. The reason? To raise Gwendolyn.
The answer to the final riddle of the sphinx. "What is the one thing worth breaking the bonds of your family?" Graham's answer? Nothing. There is nothing worth that.
After an argument with Alexander (where Alexander tells off his father for wanting to do things his way and Graham trying to forbid Alexander's use of magic), the sphinx imprisons Graham to try to capture Alexander. Graham, despite hating magic, draws on it out of desperation to save his son. His first words when he breaks out? "I love you Alexander. I always have!"
If you're doing the Compassion route, Wente and Bramble give you a gift as a thank you for all you've done for Daventry - grandma's Starshroom Pie recipe. And Wente tells Graham, "Nobody outside our family knows this recipe. A fact that will remain true now that you have it." Meaning that Wente and Bramble consider Graham as part of their family.
A minor one, but Graham finally leaves behind his adventuring cape. Why? To respectfully cover the body of either Vee/Neese, who had become Icebella and had just been killed by Manny. As the family leave, the spirit of the girl in her youth is shown, watching them go.
Chapter 5:
In the final Duel of Wits, Graham does something that Manny never expected or could have conceived of despite his years of planning: intentionally splashing himself with poison to save his castle, his people, and his family.
Mordack and Graham's interactions. Despite the last time they met where they tried to kill one another (to the point where Mordack still has the facial scars of being clawed at by the tiger form Graham used), they are very cordial and respectful to each other, unlike the contempt that Manny and Graham share.
While Graham is being tortured by Manny for defeating him for the final time, Mordack remembers back to how young King Graham was the actual one to save him from his abuse at the hands of the goblins, and acts for himself for the first time in his life: defying his "brother" and destroying the crystal keeping Manny alive, saving Graham. He even offers his hand to help Graham to his feet and slings his arm over his shoulder to help him home.
Despite losing all of his friends to time, seeing only Whisper, Acorn, and the citizens he aligned with in the Land of the Dead, Graham is actually comforted by an old friend in his final days and his final moments, willingly waiting for him to say his final goodbye to his loving family: Achaka came back for Graham to take him on his next great adventure.
As part of that final scene, Graham tells Gart that he loves him and is proud of him. Gart's reaction suggests that he's been waiting a long time to hear this.
Epilogue:
As Gwendolyn begins her adventure, two of the three items she takes with her are Acorn's wool and Achaka's bow.
At one point during Gwendolyn's adventure, Valanice and Alexander are shown silently watching her through the magic mirror.
Also during her adventure, she meets a kid in armor. This kid happens to be Achaka's granddaughter, Taskia. When Gwendolyn learns of this, she gives Achaka's bow to her, Taskia in turn gives Gwen her own bow, mirroring Graham and Achaka's interactions.
Doubles as a Moment of Awesome. After the credits of the epilogue, Gwendolyn is shown standing triumphantly on a cliff facing the sunset (or sunrise?) holding up Taskia's bow as if she's telling Graham that she finished her first adventure.
