Each moment of "The Leap Home, Part 1" that Sam reunites with a member of his family.
"Hey! Hey, it's midnight. It's April 9th, and I'm still alive! And it's all thanks to you, little brother."
Al agrees to help Sam abandon the squad's mission and go back to try to save Tom. The end of the episode reveals that Al was one of the POWs the squad was attempting to rescue, which he knew all along but kept to himself.
Sam:You could've been free. Al:I was free. Up here, I was always free.
From "Promised Land," after Sam inquires a local couple about what the Beckett family in this time period.
Husband: Everyone in this part of the county knows Tom and Martha Beckett. Fine family. One of their boys just came back from Vietnam. Sam: (smiling) Tom.
The ending from "The Color Of Truth," where Sam's racist little old lady asks him to sit and have lunch with her in the café.
Needs to be expanded on. Sam leaps into her black butler. Part of the episode is based on Sam trying to convince said woman that racism is wrong. The ending shows it's starting to take.
From "Star Light, Star Bright": "Gushie, if I should suddenly pop out of existence, I want to leave everything to my first wife, Beth."
Sam's belief in the UFO he saw and the leapee's theories about it. Al tries to walk him back, claiming he's not objective.
Sam: Are you kidding? If all scientists were objective, we wouldn't have the light bulb. I mean, we never would even have landed on the moon. Al: This is '66! You got three years before you go to the moon. Sam: I would not be traveling around in time. You gotta have the dream first, Al. Great scientists are never objective. And that's why people always think that they're loony, which is exactly what they think about Max. But don't you see? I mean, don't you get it, Al? You see, a discovery like this—I mean, it could mean... I feel the way I felt the first time I saw my time-travel calculations working. I'm so unbelievably lucky to be there on the cutting edge of solving one of mankind's oldest riddles. And now? Now, I have the chance to solve a second one in the same lifetime. I mean...nobody gets that chance. Nobody.
The ending of "Maybe Baby."
Sam quoting Don Quixote to Al at the end of "Catch A Falling Star" to prove he's going to get over his crush on his old piano teacher.
Sam: What matter wounds to the body of a knight-errant? For each time he falls, he shall rise again and woe to the wicked! Al?
Al: Here, your grace.
Sam: My armor, my sword.
Al: More misadventures?
Sam: Adventures, old friend.
The parts from "The Leap Home" that aren't tear-jerking.
For such a divisive episode, "Mirror Image" has a lot of heartwarming moments, like when cutting to quick of Sam's mission.
Bartender Al: Why did you invent Project: Quantum Leap? Sam: To travel in time. Bartender Al: Why did you want to travel in time? Sam: I-I wanted to... Bartender Al: To travel in time? To put right what once went wrong? Sam: Yes, but not one life at a time. Bartender Al: Ah, I've got Mother Teresa here. Do you really believe that all you've done is change a few lives? Sam: Basically, yes. Bartender Al: Well, at the risk of over inflating your ego, Sam, you've done more. The lives you've touched, touched others. And those lives, others! You've done a lot of good, Sam Beckett. And you can do a lot more.
The almost Sadistic Choice between going home or facing more challenging leaps:
Bartender Al: Where would you like to go, Sam? Sam: Home. I'd like to go home. But I can't, can I? I've got a wrong to put right for Al. You knew, didn't you?
The final line of the series, as Sam tells a little story.
"Instead of 'once upon a time,' let's start with the ending. Al's a live, and he's comin' home."
In "Trilogy," Sam and Al realize that Sam unintentionally conceived a child, Sammy Jo Fuller, with the woman he's been helping the past couple of leaps. At the end of the trilogy, when Al talks about the positive changes he's caused, Sam asks how he knows; Al responds, "She told me." He explains that, thanks to Sam, his daughter goes from writing tech manuals for a no-name computer company to being a member of the Quantum Leap Project—and she has an idea on how to bring him home.
However, Sammy doesn't know that Sam is her father and Al warns that, once Sam leaps out, his "swiss-cheesed memory" will cause him to forget it as well. Sam simply responds: "I'll remember."
Al wanting to save Jimmy in "Jimmy" because he lost his mentally retarded sister to pneumonia while she was at a mental institution. Also just Jimmy's brother and nephew and how much they care for him.
There was a girl named "Trudy." She was retarded, Sam! Her IQ was lower than Jimmy's. And all the kids in the neighborhood, they used to tease her. Kids can be cruel. They'd call her names, like "dummy" and "monkey face." And I hated it. And I used to get in fights all the time over this. But that's what big brothers are for, right? My mother couldn't handle it. That's probably why she ran off with this stupid encyclopedia salesman. But my dad tried to keep us all together. He was a construction worker. He went from job to job, and then when it took him to the Middle East, I wound up in an orphanage and she wound up in an institution. When I was old enough, I went back there for her, but it was too late—she was gone, Sam. Pneumonia, they said. How does a sixteen-year-old girl die from pneumonia in 1953, Sam?!
The ending to "A Little Miracle."
In "All Americans," Chuey (the best friend of the leapee) agrees to throw the football game to clear his mother's debt with a slumlord, even though there are college scouts present and the game is their best chance to get the sports scholarships that will enable them to go to college. He feigns injury to sit out and Sam tries to figure out how to change things. Al tells him to just quit, too, because Chuey would never try to damage his best friend's life under any circumstances.
Sam: They're that close? Al: Yeah. Just like you and me.
For added heartwarming, Sam follows this up by resolving the problem of Chuey's mother's debt by successfully getting her together with his leapee's father, who's been obviously in love with her all episode.
In "Honeymoon Express," Al keeps pushing Sam to affect a major historical change (stop the U2 incident, in this case) in order to prove to the government the Project is working and keep funding intact. After Al finally explains all that to him, Sam initially brushes it off.
Sam: In case you haven't noticed, Al, I don't need the Project. They aren't leaping me around anymore; God is! (walks off, but then comes back) They shut down the Project, you won't be able to contact me. Al: I was thinkin' of tyin' a couple tin cans on a piece of string. Sam: When are they pulling the plug? Al: Now. This is our last contact. Sam: I-I don't think I can make it without you, Al. Al: I don't wanna hear you can't make it without me. Of course you can, if you had to!
In "Unchained," Sam finds himself chained to a prisoner named Jasper and suddenly in the midst of an escape from the chain gang. As they try to evade a corrupt warden, Sam winds up having to tell Jasper about Al. After securing their freedom and about to part ways, Jasper comes running back.
Jasper: Say goodbye to Al for me! Sam: He can hear you. Jasper: Thanks, Al! (runs off) Sam:(smiling) Thanks, Al.
In "Shock Theater," a bout of electroshock damages Sam's memory and causes him to keep shifting between different people he's leapt into.
Sam: Who are you? Al: I'm Al. I'm your buddy. I gave you your first break. And you're the only person that believed in me when I gave up believing in myself. You brought me on this project.
In "Harvey Lee Oswald," Oswald's personality has completely taken over Sam's personality by the time Kennedy is showing up in Dallas. Al is horrified to watch Sam/Oswald setting up the sniper shot and tries to snap Sam back to himself. Just before Oswald can pull the trigger, Al realizes something: "Sam! You're 10 years old, back on your farm! Your dad is still alive!" It's Sam who says "Dad?"...and leaps out of Oswald...
Near the end of "The Camikazi Kid", Al announces his presence by singing along to a love song on the radio. Sam smiles and joins in, and they sing a verse together before stopping and greeting each other warmly. With all the hardship the two go through, it's adorable to see them just be friends.
The opening moments to "Deliver Us From Evil" when Sam is positively ecstatic to have leapt back into Jimmy and be with the LaMotta family.