In the official manga, Maryelle runs full-speed out of the guild hall upon hearing that Serara had come back safely, in a rush to ensure herself that Serara was safe and sound. She then grabs Shiroe, Akatsuki, and Naotsugu in a large hug with tears in her eyes.
Naotsugu and Nyanta haven't joined a guild because they're waiting for Shiroe to come to terms with his dislike of the guild system and start his own.
In the manga, when Shiroe realizes that Tohya and Minori were taken in and exploited by Hamelin rather then a benevolent guild, he charges out of the Crescent Moon guild hall. Akatsuki and Naotsugu start out after him, but Nyanta tells them to leave it him without even the use of words. By this time, even with Akatsuki and Nyanta having met for several days at best, she has placed enough trust into him that she would leave Shiroe's side and allow Nyanta to take over.
Maryelle's happiness at hearing Shiroe start his own guild.
The fact that Shiroe starts Log Horizon because he wants to improve the situation in Akiba.
Shiroe's constant messages to Minori promising her that he's going to free her and Tohya from Hamelin and make sure they get in a nicer guild.
In Minori's flashback in Episode 8, you see Tohya happily running and stomping about while she's crying just after the Catastrophe. The episode itself only hints at it, but the novel explains that Tohya's real-world body was crippled in an accident. He and his sister may be trapped in the game, but for right now, Tohya can walk again.
The Brother-Sister Team of Tohya and Minori is seamless. They're either very close, planned their offensive beforehand, or both.
One of the biggest reasons Shiroe went from "Akiba sucks, wish I could fix it" to "Screw this, time to shake things up" was because Minori and Tohya had been caught in the crossfire. In other words, Shiroe formed Log Horizon and blackmailed the whole city because it messed with two kids he considered himself the guardian of.
When it came time for the rescue itself, he wasn't taking any chances. After buying their guild space and locking the leaders of Hamelin inside, he placed Akatsuki at the guild hall (along with borrowed CMA members) and Naotsugu at the Cathedral, just in case.
Episode 11: Akatasuki follows Shiroe to the Eastal Ball despite Henrietta following with a summer dress. This is the same dress she ran away from in Akikbara. It may sound Faux Horrific, but it demonstrates that Akasuki isn't merely role playing when she says "A ninja must follow her master."
The only thing missing in Minor's group wasn't levels or skills, but friendship. After they take a day to truly meet each other and get to know each other, they wipe out a group of five Burning Death.
Shiroe is feeling weary, depressed and borderline despairing because of the Spirit Theory and the still unknown mystery of the Catastrophe. Then he receives a report from Minori about her group's big success, reminding him that it's enough to make friends and have fun.
Episode 17 (Volume 4, Chapter 1)
The relationship between Rayneshia and her father, Feynail. Feynail decides to head back to Maihama to defend the city in case the Goblins attack in force. When Rayneshia offers to go back with him, he tells her to stay because her grandfather needs her as a support, showing his faith in her. Keep in mind that despite Rayneshia not being expected to take part in politics at all, her father gave her vital information, and his words inspire Rayneshia to take action. Her actions end up saving not only the League, but the Round Table as well, as they successfully rally the Adventurers to help defeat the invading monsters.
Rudy polishes the mage bracers his party acquired in an earlier episode.
A twofer-Isuzu's constant worry over him considering he's a Lander subject to perma-death and Rudy brushing it off. He's an adventurer, you know, and he has teammates and civilians to protect.
Episode 20. To save time, we'll start with "Any scene with both Rudy and Isuzu in it."
Rayneshia is feeling nervous because of her sudden assignment as Eastal ambassador to Akibara, and Crusty picks up on this while they're dancing. He says the job comes with "three meals and a nap" and that no one will expect her to go to fancy balls or stuffy tea parties. The adorable neet perks right up after hearing that.
Serara wants to dance with Nyanta but is too bashful to say, so he asks her instead.
Shiroe reassuring Akatsuki that a ninja was very helpful during the last battle with the Goblin King and just what he needed to focus on saving Rudy. Then their dance at the end.
We see Naotsugu and Maryelle engaged in a private voice-chat session while he and Shiroe are off with Silver Sword for the big raid into the Depths of Palm. The sheer amount of Ship Tease here reaches to WAFF levels. Maryelle tells Henrietta that she and Naotsugu agreed on this together, just so she could check in on them and see how they're doing, though Naotsugu in particular. They chat every night at 9:00pm on the nose, and based on their dialogue, they may be planning on doing something together for Christmas when Naotsugu and Shiroe get back from the raid. Henrietta's response is a smile and some playful teasing at her friend's expense.
Willaim agrees to help Shiroe immediately. He's so casual about it, it's like a "we're friends. The reason doesn't matter" thing.
Willaim has another one when he reflects on the recent past. After the move north, he lost members due to the weather and death-trauma and his own insistence on tough raids. By implication, that ones that remained are personally loyal to him. They marched down into Depths of Palm for no reason other than "the guildmaster said so". Then we see several of them chatting about how much they like his style.
Naotsugu and Tetra's teamwork is sweet, given their earlier animosity. He talks about how our guild is our home.
Raynessia has a Heroic BSOD after discovering the truth about the Serial Killer. Akatsuki responds with sympathy and red bean buns.
Raynessia has a tsundere moment complaining that the "monster" (I.E. Krusty) was only around earlier when she didn't need him, and now that she does, he's gone.
Shiroe and Akatsuki meeting the afterlife. It's a quietly sweet moment.