Chapter 25 has Sothis firmly telling Marianne You Are Better Than You Think You Are (and informing her that Byleth is saying the same thing). For Marianne, who has spent her life praying to goddess for forgiveness and feeling unworthy, it means a lot to actually hear the goddess speaking to her personally.
Chapter 54. In an effort to keep morale from faltering in the wake of the former students turned warfighters from experiencing War Is Hell the hard way, Claude brings up a Noodle Incident involving Lorenz taking Sky Watch only for the wyvern to try and take off before he's properly saddled up. Funny in its own right, but it soon had the desired effect of breaking the tension—everyone starts bullshitting around the campfire about various expediency at Garreg Mach, which turns into Annette singing, pulling everyone into a very rowdy Kingdom campfire song, which prompts Constance to get up and start dancing, leading to other couples joining in as well. And at the end, Claude recalls an old conversation he had with his father...
Claude's father: Who wins in a battle, Khalid? Claude: The side with more forces to bring to bear? Claude's father: No, my son. The warrior who wins is the one who has the most to fight for. Claude: If that's the case...there's no way we're going to lose.
Chapter 65. Sothis finally reunites with one of her children, Indech, who completely breaks down in her arms out of sheer joy and repressed grief.
When Lysithea tells everyone about her two Crests and their origin, she immediately finds herself at the center of a massive group hug. Rhea deeply apologizes for leaving her and her family out to dry, and Claude and Atra then declare that they will force Agartha to fix what they've done to her, and everyone else backs them up.
Rhea doesn't just apologize—she outright kneels before Lysithea, face pressed to her shoes, taking full responsibility for being more concerned with her own desires than with being watchful for possible Agarthan activity within Fódlan's political systems. Seteth does the same, deeply penitent for what he believes is his own negligence. Only a select few characters (Byleth, Hanneman, Linhardt, Edelgard, and Claude in their paired ending epilogue) canonically discover what happened to Lysithea, so this suggestion of what Rhea and Seteth's response might have been is really touching.
Chapter 81 has Dimitri meeting his cousin, Altina, face to face and the meeting is sweet as Dimitri suggest that she and her mother should live in the palace after the war is over.
Byleth comes across Altina with the Agarthan children with Mercedes and Emile, Mercedes reading the story of "Stardust" to the children and the children listening in and talking about the story. It's small but it shows that the Agarthans and humans of Fodlan could get along when they get over their differences and biases.
In Chapter 85, Count Gloucester shows up and attempts to turn the Alliance against Claude for being a half-Almyran insult to the goddess. What follows is Bernadetta, Felix, Flayn, Dimitri, every single Golden Deer including Lorenz, and finally Byleth (the Archbishop of the very faith the Count is using to justify his bigotry) going right up to bat to defend him.
Chapter 88 has the students react to Byleth's pregnancy in varying degrees but also spoke of concerns for her state before they all agree and vow to protect and help Byleth and win the war.
