Episode 1: It's About Time
- Marty feels too guilty to lie to Emmett about getting a patent, and confesses.
- Also, when Marty and Doc first re-unite after months:
Marty: Doc, we've only been back together five minutes and we're talking about the end of the universe! I've missed that.
- When Doc's locked up in Tannen's police van, Marty tries to pilfer the keys to get him out. Tannen punches him, and Doc yanks Marty through the bars, saving his life. You can also see a wedding band on his ring finger. It's nice to know that even though Clara isn't physically present, she's still there in spirit.
- In Marty's inventory is a photo of his father. Examining it has Marty comment that his dad is actually pretty cool. It's a nice nod to the relationship Marty developed with his Dad in 1955.
Episode 3: Citizen Brown
- In the Citizen Brown version of Hill Valley, Marty is a square, a stickler for the rules and he never even went to the prom with this version Jennifer (he sees the photo of him alone at the prom, with her fading after he crash lands). Through some fancy guitar playing, Marty wins her back, culminating in a Big Damn Kiss right in front of Edna Strickland (as Marty planned).
- Marty finds the Citizen Brown era version of Einstein in the world where dogs have been outlawed (thanks to Edna Strickland). Einstein is a muzzled stray stealing food. Marty promptly tracks him down, feeds him and removes his muzzle, earning the dogs trust.
- After suffering an emotional breakdown, Citizen Brown sees the design for the flux capacitor in Doc's notebook...and begins to recover his true self. His whisper of "Great Scott!" as he realizes the truth that's been nagging at him all these years — and his subsequent enthusiasm and joy as he races off to get started on fixing the time machine — is simply beautiful.
- Marty's father deciding to help you. Most of the episode he's shown as a coward and a voyeur, filming people in Hill Valley without their knowing in order to get brownie points from the Brown administration. Later, when his tapes are stolen, he still refuses to help until you remind him of his father. Eight words: "Never be afraid to do the right thing."
- When Citizen Brown asks Marty to explain himself, one of the options the player can pick is "I'm not supposed to be in this timeline." By clicking that, Marty calls Citizen Brown his "best friend in the whole space-time continuum."
Episode 4: Double Visions
- Citizen Brown taking pity on his wife-to-be despite Marty's plan to break them up. Slightly dulled by Edna's role as the Big Bad up until then, but only slightly.
- Doubling as an Awesome Moment, Marty's dad punches out the police to save his wife.
Episode 5: OUTATIME
- Edna finds true love with Kid Tannen, and even becomes Einstein's dog walker.
- Even better, in the original timeline Kid was given a life sentence in prison. Here, he's managed to turn over a new leaf, now living a normal life with Edna.
- Young Doc and his father making up for their behavior against each other and also finding out why Doc went into the past: to give Marty a McFly lineage book, from Seamus to present.
- Speaking of why Doc went to the past, it becomes sweeter especially when you find out why he went back to 1931. Doc had no info about Marty's grandmother Sylvia...because she was under the stage name Trixie Trotter! Thus Arthur eventually married the girl of his dreams!
- The series-long arc is this. In episode 2, Marty notices an attraction between Artie and Trixie and while he's happy his grandfather is "sowing his oats", he hopes they don't get attached, because eventually Artie needs to father George with Marty's grandmother Sylvia. By episode 5, he's in full-blown panic that things are getting serious between Artie and Trixie, and when he hears they got married, he confronts them, believing the timeline is wrong and he's about to fade out from existence at any moment. But when he blurts out to them that Artie is supposed to marry a "Sylvia Miskin", Trixie says her name is Sylvia Miskin, showing that this was the "right" outcome all along, especially considering Marty's advice to Artie early in the series regarding meeting a "Sylvia" was to "let nature take its course". They were meant to end up together.
- After helping young Emmett to achieve his Hill Valley Expo Demonstration to give him back his dreams of becoming a scientist, Young Emmett asks for an explanation about who Marty is. Marty gives him a future newspaper piece, making him promise to never look at it until 1986 when he will be given the key of the city. After Young Emmett walks away and asks if he will see Marty someday again, Marty answers "I guarantee it.". Then Marty witnesses 1986!Doc coming out of the DeLorean and saying "You have a theatrical way of sending messages."
- Also since Emmett reconciled with his father, instead of abandoning his old home, he maintains it as a part-time home when not time-traveling. So, instead of the home being sold by the bank, Emmett's just having a yard sale.
- Marty and Doc sharing a hug after being separated for a long period of time (to them). It doesn't seem like much till you take into account not only had Marty thought Doc was dead after fading from existence but he was trapped in the past with no DeLorean, no thanks to Edna disappearing into the past with it.
