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.
YMMV: Beverly Hills 90210
The original series, or the overall franchise, contains:
Anvilicious/Some Anvils Need to Be Dropped: Zig-zagged. The show, especially in seasons one and two, was very topical - addressing issues such as racism, alcoholism, drug abuse, etc. in a somewhat After School Special-like manner. In some episodes, these issues were handled very well. In others... to call them heavy-handed would be a massive understatement.
Awesome Music: The theme song! Or, at least, the two versions used from season two onward.
Draco in Leather Pants / Ron the Death Eater: Brenda's fans would have you believe that Kelly ruthlessly stole Dylan from her best friend while kicking puppies and laughing about it, while Brenda saved bunnies in Paris. Kelly's fans are slightly less extreme in their view of Brenda, but they do paint Kelly somewhat more sympathetically than they perhaps should.
Fan-Preferred Couple: Even though Dylan/Kelly ended up being the endgame couple in the end, you'll find that many (if not the majority of) fans ship Brenda/Dylan and Brandon/Kelly instead.
Brandon/Andrea also has a popular following (especially with fans who don't like Kelly), they were ship teased several times in the early seasons, but it ultimately never went anywhere.
Germans Love David Hasselhoff: The original series was very popular in Japan in the 90s, judging with the considerable amounts of references in many anime series and even videogames. Even Tomoya Asano, the producer of Bravely Default admited he took some inspiration from this series for the game.
Narm: Not as extreme as the show's numerous parodies might have you believe, but it certainly has more than a few moments of this. The Full House Music often used to underscore dramatic scenes certainly doesn't help matters.
Retroactive Recognition: Matthew Perry appeared as a one-shot character in the episode "April Is The Cruelest Month". He would go on to play his famous role as Chandler Bing 3 years later.
Unfortunate Implications: During Dylan's coma dream, his male drug dealer insists that Dylan has had sex "with everyone in this room" before laughing in a very creepy way.
Particularly icky in light of the fact that one of the women in the room was his little sister. Furthermore, Dylan was only 19 pr 20 at the time, but the amount of women present would indicate that he'd been sexually active since about age 11 or so.
The lack of minorities in the show. On the E! True Hollywood Story for BH:90210, Aaron Spelling admitted this was one of the aspects of the show that he deeply regretted.
The Brenda/Dylan/Kelly love triangle has shades of this. Granted both Brenda and Dylan cheated on each other, but Brenda owned up to her cheating immediately. Dylan didn't confess until after he was officially with Kelly and they both had a guilty conscience about it, and this was after both Dylan and Kelly made Brenda feel rotten about her cheating and her anger at how quickly they had hooked up after Brenda and Dylan's breakup. But Dylan and Kelly (and the show itself) treated Brenda's anger over their betrayal as being insane and irrational, and Brenda was constantly in a state of misery while Dylan and Kelly unabashedly continued their relationship on. Shannen Doherty also disapproved of the direction of the storyline, because she thought it sent the message that it was okay for a girl to steal her best friend's boyfriend and not face any consequences about it.
The sequel series contains:
Complete Monster: Douglas Atherton is a wanted rapist from England. He comes to America, renames himself Miles Cannon, and becomes a teacher to find new victims. At the end of season 2 he raped Naomi Clark, even telling her that because she lied about him sexually harassing her earlier, no one would believe her about her rape. After he is found out, he flees his apartment, only to confront Naomi later on and threaten her with a knife.
Creator's Pet: Annie could be considered this, particularly in the earlier seasons. In season 1, Naomi told Annie she would be uncomfortable with her dating Ethan since he was Naomi's ex. So what happens? Annie dates Ethan behind Naomi's back. The writers then expected the audience to feel sorry for her when Naomi hooks up with one of Annie's exes at her Sweet Sixteen party. The majority of fans sided with Naomi instead. Annie's Pet status continued into season 2 when she took the ENTIRE season to confess to her hit and run, but ends up only being put on house arrest for a couple of months (again, we're expected to sympathize). By the later half of season 3, the Annie hatred started to die down due to her screen time being cut significantly.
A canon version with Riley's death paving the way for Annie and Liam to get back together.
This was actually not the case with the fans. While they didn't like him for dating Annie, they really didn't have anything against him.
Dude, Not Funny!: Adrianna says her mom is desperate to be Dina Lohan while high. Dina Lohan is probably the last person any mom wants to compared to.
Ensemble Darkhorse: Mark. At least, people who comment on him consider him one of the most interesting minor characters, and have shown that they want him to appear more - maybe that's why he still is.
Fan-Preferred Couple: Annie and Liam have become this. It's weird because they experienced Foe Yay in Season 1, became friends in Season 2, started dating in Season 3 with a few breakups in between and broke up in Season 4 and fans want them back together.
Foe Yay: Annie and Liam in Season 1. It fades over time and long before they actually start dating.
Arguably Annie and Naomi in Season 1 and 2.
Naomi and Austin are a canon version.
Hilarious in Hindsight: In Season One Naomi says if she were a lesbian, she would date Adrianna. In season 2, a lesbian does date Adrianna.
Also in Season One, George played Kellan Lutz is on the Lacrosse team. Lutz would later star in a movie about Lacrosse called A Warriors Heart
Harry gave his son up for adoption and later adopted Dixon, who is black. In Season 5, it's revealed Harry's grandchildren from said son are half-black.
In the fourth season, Liam's friend Jim, played by Stephen Amell returns from being lost at sea.
Magnificent Bitch: Both Naomi and Annie have shown shades of this, Annie probably from hanging out with Naomi.
Moral Event Horizon: Many fans feel that Adrianna is irredeemable at this point. After switching out Silver's medication for Bipolar Disorder with placebos, it's going to be very hard to make Adrianna likable ever again.
Rescued from the Scrappy Heap: Annie dating Liam is what got the fans to finally accept her before she eventually became the most popular character on the show.
They Wasted a Perfectly Good Plot: They should have shown Adrianna's mom while she was dating Gia, based on Maeve Quinlan's other role. Even if she was completely supportive of it it could have been a great contrast
Unfortunate Implications: The treatment of fathers in the series is shockingly poor. Of the main cast two have fathers who are outright criminals (Navid and Liam), five have fathers who are Jerkasses (Naomi, Teddy, Ivy, Austin and Liam again - his step father this time) and four have fathers who are simply not in their lives much/whose absence has never been explained (Annie, Dixon, Silver and Adrianna.) In other words every single teen main character has at best a distant relationship with their father by the 4th season of the show.
By Season 4, their parents are completely gone, save for one appearance by Liam's mom, who he quickly whisks away.
What The Hell Casting Agency: Ryan O'Neal as Teddy's douchebag father? Considering how good of a father he is in Real Life, that is just wrong.