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.
Big Lipped Alligator Moment: The Disney World episode is full of them, mostly involving members of the extended Connor family having trouble realizing that various Disney characters aren't actually real. Granted, the episode was only shot because of Executive Meddling, so there was probably a certain amount of Snark Bait deliberately included.
Designated Villain: The woman Roseanne and Jackie's father was seeing for over two decades, though this is more in the episode where he died. When Roseanne meets her at a bar to try and talk about the last years of his life, Roseanne learns that her dad told her that his kids never appreciated the sacrifices he made for them and storms off in anger. Though, this is mostly because the woman only had Al's side of the story.
Fanon Discontinuity: A lot of people have this reaction to the show's final season, and the final episode in particular.
Flanderization: A few examples, particularly toward the end of the show. Roseanne slowly got more bossy and controlling toward her family and Jackie became more neurotic and quirky. More troubling, after he met Scott, Leon went from Straight Gay to encompassing a few gay stereotypes and his sexuality became the subject of many more jokes.
"Funny Aneurysm" Moment: When Bev joins AA she accuses Dan of being an alcoholic because he has a keg at his Super Bowl party. These are Played for Laughs. This episode comes across as jarring after John Goodman admitted he was an alcoholic for thirty years.
In an early episode DJ bites his Pop-Tart into the shape of a gun and goes "Bang, bang." Flash forward to 2013 when a kid could get suspended from school for doing the same thing.
An early episode has Crystal lamenting her dead husband, Sonny, and wondering what her life would have been like if he'd lived. Once she leaves the room, Roseanne hugs Dan tenderly, and jokingly ponders what her life would have been like if Dan had lived. May also be a Foreshadowing / Hilarious in Hindsight.
In one episode, Dan goes to DJ's school for the first time. The principal is stunned to meet him, as DJ had told everyone his dad was dead. Cue that finale and...
Harsher in Hindsight: Watching Roseanne and Dan yell at Becky for underage drinking is kind of hard to watch after John Goodman admitted he struggled with alcoholism.
Hilarious in Hindsight: Roseanne has lost a winning lottery ticket with a connection to the number one-hundred and eight.
In one episode, Roseanne is posing for a sexy photograph for Dan for their anniversary. As she's having second thoughts, she says, "What if the negatives get out, I'll never be President." Roseanne Barr actually did run for President in 2012.
In some early episodes, DJ is a Creepy Child who destroys his sisters' Barbie dolls. Laurie Metcalf, who plays Aunt Jackie would go to be the voice of Andy's mom in Toy Story, which features a character who tortures toys.
Narm: Watching the beginning of the tornado episode with them treating a tornado watch with gallows humor and panic can be rather ludicrous to viewers from Tornado Alley (For the record, a tornado watch, basically means "Conditions are right for a tornado; stay tuned, one might form. A tornado warning means "A tornado has been spotted, You Can Panic Now.) They are vindicated soon after though...
Seasonal Rot: The ninth and final season. The show had been in decline for some years before then, and opinions vary on when it started, but the last season is generally seen as being by far the worst (the drastic Genre Shift did not help matters).
The controversial and shocking revelation that the whole show was Roseanne's book, and the last season represented Roseanne's decline as an author after the death of her husband rescued it for some people, though for others, it was just the icing on the cake.
Values Resonance: The realistic focus on the usual challenges and struggles of a working-class American family still remain relevant 20+ years later. Roseanne Barr even said during a recent interview that they're even more relevant than they were back then.
What Happened to the Mouse? : Becky keeps guinea pigs in the garage in Season 1. They're only mentioned a couple of times, then no mention is made of them again. Perhaps that's the Noodle Incident on the main page.
The Woobie: David. Especially once we meet his mother.