These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Players who pursued Celia as Mark think differently of Marlin than those who pursued him as Pony.
Base Breaker: Is Rock a lazy moron or does he have Hidden Depths? Him being Lumina's love interest, and the way he treats her in their Heart Events, only adds the debate.
Big Lipped Alligator Moment: A really really weird moment. One night Van might visit Romana's house and an event comes up where he tries to purchase a painting on her wall, she refuses and it is revealed that Lumina painted it. Lumina then asks her butler in privacy to do her a favor. Suddenly it cuts to the butler out in the forest charging up and attacking the local yeti, apparently trying to steal the little lock of hair it has on its head to be made into a paintbrush. The situation is never delved further and you are left alone in the forest afterwards. Maybe it was a bad trip from eating the mushrooms by the tree.
Crowning Music of Awesome: Most of the soundtrack, as is standard for the series. The game lacks seasonal tracks, or really music at all besides your farm and during scenes, but makes up for it with records (expecially Quiet Breeze).
Ensemble Darkhorse: After ANWL came out, Marlin became the favorite amongst most fans compared to the other two spouses.
Fanon: When the original AWL game came out, it seemed unanimous amongst fan sites that Wally left the city because he injured his leg in a race and can no longer run professionally.
Nina being the pink haired Nina is a common belief. Most likely from the Gameboy games, or a timeline where you don't marry her, considering AWL takes place in the FOMT timeline and not the 64 one.
Kate looks nothing like her noticeably Asian parents. This has led many fans to assume she's illegitimate or adopted.
Fan-Preferred Couple: Many guys really wanted to marry Flora. And a lot of girls really hated Chris for marrying one of the hottest men in town.
For younger players, there was often confusion on who were the love interests, since the manual was a bit vague on "it's only these three." Some people ended up marrying Celia (the default) in AWL because they were trying to get Flora, Lumina (not realizing she was a kid) or even Vesta. Likewise, a few ANWL players wasted time trying to woo Cody.
Pony typically is paired with Marlin in fanart and fics.
Fridge Horror: It's pretty normal in Harvest Moon games for the Harvest Goddess to be indisposed, such as being turned into a statue or something and you need to rescue her. But the Harvest Goddess in this game isn't here. The sprites think she might be sleeping, but they don't know. She's just gone. Their deity has seemingly abandoned them.
Fridge Brilliance: It's the Mineral Town Goddess. She has just left to live in another pond, and being the Jerk Ass she is she doesn't respond or say anything. She comes back sometime within the hundred years that passed between this game and DS.
There was an event that occurs during one of your yearly visits to the pond with the sprites where the goddess talks to you. You still can't see her, though, and it boils down to her telling you to let her be.
Another Fridge Horror occurs near the end. Your character seemed a bit.. Young, right? Romana is alive and probably in her 90s, your son is barely an adult when you had him in your 20s, and the other villagers near your age are just turning gray. It's implied you died in your 50s, maybe 60s, which is quite young. Obviously all that hard farm work did damage to you.
Supported even more in official art, which shows you with features (like a beard) that aren't used in Mark's model. As early as your sons early childhood you're turning prematurely grey.
Game Breaker: The high price of tree seeds is supposed to be justified by the fact that they continually regrow fruit. Eventually you get the ability to turn crops into seeds, which becomes the easiest way to get money in the game; selling hybrid tree seeds instead of the fruit.
Porting Disaster: The PS2 version is considerably more laggy, slower, and more dull than the Gamecube version; probably due to the Gamecube being more powerful. Not helped by the fact that this was supposedly an Updated Re-release of the boy version.
Ron the Death Eater: Muffy's far from promiscuous but fans are fond of berating her due to her flirty nature and multiple boyfriends. It doesn't help how she dresses, but then again she is a bartender and cleans up after marriage.
The Scrappy: Rock. At least among some people, choosing between him and Marlin is not too hard in the girls' version.
Katie and Romana, one for being a bratty bully for most of the game and the other for never dying.
True Art Is Incomprehensible: If you become friends with Cody, then he will give you one of his art pieces for your house. It's a pile of twisted scrap metal. He also has a weird Metal formation in front of his trailer.
Urban Legend of Zelda: There were tons of rumors spread about the game. Like there being a way to unlock the mysterious abandoned shack, or how to get into Romana's shed, or getting every single tablet in the game will give you the chihuahua found next to the dig site. All of these rumors were completely false.
Besides the chihuahua, there are several other animals roaming around, including a raccoon on Vesta's farm, a bandaged lizard in the forest, and a large turtle by the pond. None of those can actually be acquired, but try telling that to the countless people who insist you can.
Values Dissonance: In Another Wonderful Life and A Wonderful Life: Special Edition Lumina is sixteen years old but can be courted by someone in his twenties or even married. English translators upped her age to eighteen, the Age Of Majority in many places.
The Woobie: All of the girls you can potentially marry can become this. If you don't marry Nami then she runs out of money and has to move back in with her deadbeat dad far away. If you don't marry Celia then she ends up a jaded bitter man-hater who is always riding on Marlin's ass. If you don't marry Muffy then she will become incredibly depressed over growing old and alone, and can sometimes be found on the beach crying over how happy your family looks.
Several other characters, to varying degrees. Lumina feels overburdened by her Grandmother, lost her parents at an early age, and cries when you get married due to having a Precocious Crush on you. Hugh is often seen crying early in the morning when he's a kid, possibly due to his father. Grant has two Jerk Ass girls to take care of, and apparently has a horrid life as a Salary Man.