"Scott's Tots" has a bittersweet one. Near the end, Erin tries to cheer Micheal by telling him of the increased graduation percentage of the class. So even if he failed, he did arguably help the children.
In the early S2 episode "Sexual Harassment'', Jim feels the usual awkwardness when Pam, Roy, and Pam's mother are together in the office, getting along. After Roy leaves, however, he does overhear one exchange from his desk that gives hope that his feelings for Pam are not as one-sided as it seems to this point in the series:
(in whispered tones)
Pam's Mom: So which one is Jim?
Pam's Mom: I just wanted to know.
In "Crime-Aid", Bob Vance sets off a bidding war for a single hug from Phyllis, in order to raise money to pay for people's stuff which has been stolen from the office. David Wallace, Dwight, and Andy all join in. Phyllis, who puts up with crap from everyone, including Dwight, just sits with a delighted look her face. Everyone pulling together was terrific, as was Phyllis finally getting a boost for her self-image. It ends with Bob paying $1000 for a hug from his own wife, just to cheer her up and help out the company he shares the building with, so its a CMOA for him as well.
'"Employee Transfer". Michael is deeply depressed after splitting up with Holly. Darryl, who is often enemies with Michael cheers him up by inviting him to sing a blues with him in his car as they travel home. Doubles as Tear Jerker and Funny (Michael isn't an apt learner when it comes to singing blues).
"Lice". After all the shit she has been through, Meredith finally gets the respect she deserves as a single working mom. And that comes from Happily Married Pam of all people.
Pam's marriage however is under strain recently with Jim away in Philadelphia working at his new business.
Even after years of verbal abuse from them, Kevin still considers Angela and Oscar his friends and admonishes Senator Lipton for exploiting them for his political campaign.
When Jim and Pam find out that Pam is pregnant in "Company Picnic", and the whole scene is silent but you know what is happening just by their reactions.
In "Niagara: Part 2" when Pam accidentally tears her wedding veil, Jim cuts his tie in half so they're "even".
We find out that before the church wedding, Jim and Pam snuck away and got married on the Maid Of The Mist.
The ending of "Goodbye, Michael". Hell, the entire episode is rather heartwarming.
Jim, in Last Day In Florida, decides to do anything that he can to stop Dwight from going into the conference and getting fired. And by that, we mean wrestling him to the ground and blocking his path outside the room, getting both of them hurt a few times in the process.
The look on Jim's face when he stops at the door at the end of the hallway is heartwarming in itself. He turns and looks over his shoulder and you can feel him realizing he really does not want Dwight gone. Cue tackle.
Special mention has to be made to "Business School", where Pam has spent the entire day at her art show unsatisfied as no one from the office as come to offer strong support for her work (the only familiar faces to show up were Roy and Oscar, the latter of whom criticizes Pam's work with his boyfriend). Enter Michael, who, after dealing with the conflicts of Ryan's business class, responds enthusiastically to Pam's work, particularly the drawing of the office building's exterior.
Michael: I am really proud of you.
Pam: (hugs Michael) Thank you.
A moment that goes from Tear Jerker to funny to this is when Michael, at the end of his rope trying to manage his finances with his unemployed girlfriend and a bad house investment, decides to declare bankruptcy and does so by stepping out of his office and stating "I DECLARE BANKRUPTCY!!" Oscar, one of the accountants, comes in and spends a while trying to help him with his finances.
In third season's "Branch Closing", when everyone in the office learns that they're keeping their jobs because it is the Stamford branch that is closing and not theirs, Kevin and Angela, of all people, immediately hug each other out of relief, with the huge smile on Angela's face particularly telling.
Another hug in the next episode, "The Merger", when Jim finally returns to Scranton. Pam has been acting giddy about it all morning and the look on her face when he walks into the office is priceless. He first tries to make a joke about it ("Hi, I'm Jim... I'm new here") but Pam just Glomps him.
The end of season's 3 "The Job". In a talking head, Pam expresses her regrets about how it never worked out between her and Jim, but that she's OK with it and that she knows they will still be friends, even if he gets the job in New York City. As she is saying all this, however, we see Jim cancelling the job interview and driving back to Scranton—alone, without Karen. He barges into her talking head interview and asks her out for dinner. Completely surprised, Pam automatically accepts and Jim says it's a date. Cue Pam turning back to the camera, positively beaming and with tears in her eyes.
"Back from Vacation": Pam is crying in the hall as she has just helped further Jim and Karen's relationship by talking some sense into Jim. Sure, I Want My Beloved to Be Happy, but it still hurts like hell anyways. Dwight walks in and sees her crying. His first reaction?
Dwight: Who did this to you? Where is he?
He then sits down besides her and puts his arm around her. It's awkward, his last remark doesn't help ("So you're PMSing pretty bad, huh?") but hey, it's the thought that counts.
On a similar note, as soon as Phyllis admits that she thinks Bob might cheat on her, Dwight immediately stops what he's doing and gets down on her level to listen to her. The next shot we see of them is entering the party room, and Dwight dances with her despite him saying normally he wouldn't. Its obvious he's trying to cheer her up.
The whole office dancing down the aisle at Jim and Pams wedding
Andys 12 drummers drumming for Erins secret santa gift
The 'Bring Your Daughter To Work Day' episode, where Michael is initially uncertain about being around the kids the other workers bring in, but then proves capable of keeping them entertained across the whole day and thoroughly enjoys his time with them.
After Brain got fired for interfering with the documentary, the rest of the documentary crew decide to do likewise and help Jim perform a romantic gesture to Pam. They've clearly grown fond of them if they're willing to jeopardise their careers.
"Livin' the Dream: Part 1" ends with Dwight finally getting his longed-for Regional Manager position, at least in part due to a recommendation on his behalf from Jim to David Wallace. After the promotion is announced, Jim congratulates Dwight, who thanks him...then orders Clark to "get out of Jim's seat" across from Pam. Then he names Jim as Assistant (to the) Regional Manager.
Part 2 has Andy say goodbye via his version of "I Will Remember You". The song is so touching that some of the employees rethink their opinions of him.
Dwight's proposal to Angela in A.A.R.M.
In the same scene, Dwight finds out Philip really is his son. His reaction is just so amazing.
The ending with the cast watching the first episode of the 'documentary'.
Dwight is often the Jerk Ass of the show, but it's occasionally nice to see something nice happen to him. Michael's recommendation letter is not only a nice moment for the audience, but Dwight is clearly affected by it, even as he complains about it being repetitious.
To Whom it May Concern: The dictionary defines 'superlative' as 'of the highest kind, quality, or order; surpassing all else or others; supreme.' I define it as Dwight Schrute. As a sales executive, as a leader, as a man, and as a friend, he is of the highest kind, quality and order: supreme.'
What Dwight does in "China": He and Pam are fighting it out as building owner and office manager respectively. Pam realizes she's inevitably going to lose because she is just making things up as she goes along, and breaks down to Jim in the stairwell about how she fails at everything. Suddenly Dwight's assistant delivers her a book of building standards that Dwight has violated, and Pam uses that information to force Dwight to go back on his more draconian policies. Dwight talking heads about how he did only capitulated to keep Pam from carrying through on her threats so he can keep leeching off her work. Under this, on screen, we see flashbacks of Dwight seeing the breakdown on the stairs, showing his assistant the law books, and making him give it to Pam so that she would win their fight and feel good about herself. Before he drives away he watches her smile in the rearview mirror. Could double as a Crowning Moment of Awesome.
The adorable trainwreck that is Andy and Erin's relationship. A couple key examples being Andy successfully asking Erin out in "Murder", only to back out of it later when he believes he mistook her excitement as simply role-playing, and the 12 Days of Christmas presents in "Secret Santa" (which initially go horribly wrong, but end on a very sweet note).
Andy: "I suppose a gentleman might throw in the towel, at this point. But guess what? Not gonna happen."
Not to mention this scene from Murder, when Pam becomes a Shipper on Deck for Andrin:
Pam:"It was fun though because I got to hang out with Andy Bernard. He's really cool."
Erin:"Yeah, he is!"
Pam:(suprised) "Yeah, he is."
Erin:"He's like the coolest person I ever met!"
Andy FINALLY asks out Erin in The Delivery and despite her being previously angry at him, she happily and immediately accepts.
The commercial that Michael produced for the branch; you expected it to be awkward and terrible and it turned out to be much better than the corporate version. Something about the slogan — "Dunder Mifflin: Limitless paper, in a paperless world" — seems to perfectly sum up Michael's desperation and forbearance up to that point in the series.
In "Baby Shower," after having him try his hardest to help her, Jan orders Michael not to date Holly. Michael's response? To walk up the stairs, hug Holly warmly, and ask her if she wants to go out. Holly's expression is what does it, really.
Michael: I didn't feel much when I held Astrid... but I got a good feeling from Holly.
In Season 4 after Andy has started to date Angela, Dwight is crushed and goes and sobs in the stairwell. Jim, who has spent 98% of his time in the office making fun of Dwight, tormenting him, or both, goes in there and tells Dwight the following:
Jim: Did I ever tell you why I left Scranton? Yeah, I didn't think I had. Well, it was all about Pam. Yeah, I mean, she was with Roy...and I just couldn't take it. I mean, I lost it, Dwight. I couldn't sleep, I couldn't concentrate on anything. And then weird stuff, like, food had no taste. So my solution was to move away. It was awful. And it is something that I wouldn't wish on my worst enemy. And that includes you.
...which is followed soon with the utterly fantastic "In fact, I'm in love with Italian food."
In the same episode, Jan finally shows some tenderness towards Michael after months of one-sided kindness on his part.
The ending of "The Carpet". After the prank in Michael's office, Jim has to move to Kelly's neighboring desk. He spends the rest of the day having to choose to suffer from either Kelly's twittering or the interactions between Pam and Roy. At the end of the day, he goes back to his desk and listens to his messages...and smiles when he finds seven messages from Pam, calling him just to talk to him. He walks back to his car and leaves, still smiling.
Another good example is after the younger, more competent boss in Stamford, Josh, who Jim admired, used Dunder Mifflin's promotion offer as leverage to get a better job at another company, thus putting most of his employees out of work, it cuts immediately to Jim doing a Talking Head-"Say what you want about Michael Scott, but he would never do that."
The ending of "Beach Games". Following a rather awkward scene, the entire cast is singing The Flintstone's theme song. No one seems annoyed, either, they seem like they're genuinely having fun. Even when Michael screams "WILMA!" everyone's just smiling instead of being annoyed.
In 'Viewing Party' Erin spends the whole episode trying to get Michael to like Gabe. Michael can't understand why it so important to her and when she confronts him he yells "its not like I'm your father!" Erin's silence makes it clear that she does indeed consider Michael to be a father-figure, and when Michael realizes this he starts saying typical dad phrases like 'go to your room'. They are both grinning the whole time and its such a sweet moment for Erin who's an orphan, and Michael who desperately wants family.
Doubles as a Tearjerker for the moment after Michael yells at her. She looks so vulnerable and scared, and if Michael wasn't the type of person he was, it could have gone really badly.
Several in the "Finale" episode:
Michael showing up for Dwight and Angela's wedding to be Dwight's "Bestest Menschen". This time he's finally acting like an adult and Angela - the one who probably disliked him the most - is happy to see him.
In the run-up to the finale, the show's producers had stated that Steve Carrell would not be involved at all. His name wasn't even shown in the credits. The writers broke the fourth wall and pranked us all.
The reveal that he and Holly have several children, which he is so excited about that he owns and pays for two phones just to hold all of the pictures he shows people.
Erin's longlost parents showing up at the panel session.
Stanley has retired to Florida and carves wooden birds, and it's clear that Phyllis misses her old desk-mate and friend. Later in the episode, Phyllis shows off the little statuette that Stanley carved for her as a gift — a small likeness of Phyllis with bird legs — and by the tone of her voice, you can tell how much it means to her. She even stresses that, buried beneath all the grumpiness, Stanley is really a very kind man.
Jim and Pam go into Dwight's office to give their resignations, Dwight immediately cuts them off and fires them. When they try to stammer out an explanation, he reveals he did it so they could have severance pay.
Jim's last prank of the series, "Guten Pranken", in which he uses his knowledge of all of Dwight's quirks to give him the best wedding day he possibly can.
Toby had it pretty rough in the end, but his spirits pick up a little when the office crowd invite him back to Dunder-Mifflin for one last party.
All of the final speeches. By this point, all the characters know that they'll go back to being nobodies the next day and decide to make the most out of their time.
In a deleted scene, the employees realise that the most senior member of their group is the office plant. They decide to take it out and plant it in the sun, so that it can have the freedom that so many of them have gained.
After struggling for years to find a foster child, Nellie gets Ryan's.