Ass Pull: Reid dies and is just able to give his heart to a dying Chris so he can survive.
Creator's Pet: Gwen Norbeck. She was only meant to be a temporary character, but the writers took a real shine to Jennifer Landon, the actress who played, and decided to keep her on the show and integrate her into the major storylines. This included making her the little sister to Carly and Rosanna—both of whom are at least twenty years older than her; transformed her into a giant woobie when her baby died and Casey and Will fought over her; made her frequent targets of stalkers, which included turning Adam Munson, who'd served as The Conscience to many other characters, into a sociopath and rapist against her; and her singing and songwriting capabilities were lauded and praised by everyone and hailed as genius. Anyone who didn't think of Gwen as anything but a perfect angel was instantly vilified.
Ending Fatigue: Many people felt this about Barbara's kidnapping. She was stuck in the warehouse for many episodes without anything actually happening.
Ensemble Darkhorse: Eric Sheffer Stevens is a Real Life example of this trope. A large number of people, including those who despised the character Reid and/or were annoyed at all the screen-time newbie actors were given, praised him and his acting abilities. Reid also counts, partly because he was so different from the other characters: a lampshade hanging, snarky, Only Sane Man who was funny and enjoyable to watch. Also because Luke finally got a love interest who was someone other than Noah.
Fanfic Fuel: Reid Oliver is brought to Oakdale because he is blackmailed by Luke. Luke eventually reveals he didn't actually have any dirt on him, but it's never revealed exactly what it was Dr. Oliver was so desperate to hide.
Canon Fodder: Reid's childhood. After his death, his uncle gave a couple of hints about it, though it was clear the two didn't get along very well.
Fridge Horror: The new liver Luke has (which was illegally obtained) won't last forever, he will eventually need a new one. However, because of his drinking problem that destroyed his original liver, he wasn't eligible to receive one from the hospital.
"Funny Aneurysm" Moment: If Reid hadn't made so many heart jokes, and if people hadn't been so bold as to call him 'heartless', rewatching his storyline would be significantly easier. There's also one scene that has Reid, after giving Luke a very passionate kiss, say "Life is short, it's very short sometimes." He dies pretty soon after this.
Reid: Wow, Doogie. That's an invitation I never expected from you.
Reid to Chris: Alright, I'm not coming onto you, but drop your pants.
Chris: Yeah, I'm thinking the lower lumbar area.
Reid: Oh, rats.
Before the kiss in Dallas, Reid and Luke's interactions were a good, subtle example of the above tropes. The latter turned into the former once their involvement in the neurology wing came into play.
Informed Wrongness: Katie blames Henry for Brad's death, though if anyone is to blame it's Henry's mother and Katie's the one who decided to give her a chance. Many fans blamed Katie because she made the dumb decision to go to the warehouse and Brad went to rescue her. She doesn't talk to Henry for months and he's portrayed as being in the wrong, and when she betrays Henry later, she expects to be Easily Forgiven and she is.
Moral Event Horizon: As far as Henry is concerned Vienna crossed this when she told him that she had miscarried a baby that never existed so that she wouldn't get caught in her lie. Katie decides enough is enough and tells Henry the truth.
Katie deciding to get involved with this in the first place was this to a lot of fans.
Damian deciding to hide evidence indicating Holden was still alive so he could marry Lily.
It took Carly screaming at her young for her to realize she needed professional help for her alcoholism.
Portmanteau Couple Name: Quite a few: Nuke (Luke and Noah), Carjack (Jack and Carly), LuRe (Luke and Reid), Peg or Maul (Paul and Meg), Lilden (Lily and Holden), Cake (Luke and Casey's fake relationship) etc., etc...
The aftermath, in which Reid gives Luke power of attorney and dies looks set to return to Tear Jerker status.
Scapegoat Creator: Jean Passanante, one of the head writers, was blamed for the declining quality in writing near the end and getting the show cancelled. The previous cancellation of Another World was often cited as proof. Executive producer Chris Goutman got a bit of this too.
The Scrappy: For longtime fans, any new character who gets more screen time than their favorite character.
The one thing that makes this trope stick for Janet though was her bachelorette party before marrying Jack. The women who throw the party are ladies who were not on good terms with Janet, and yet they showered Janet with attention like she was a longtime friend. Where do they throw the bachelorette party? At Carly's nightclub unannounced!! And even though Carly owns the nightclub, the women treat Carly like an intruder and angrily demand to know why she is there! It's her nightclub! That's why she's there!!
Katie to some, although she usually means well, she tends to get involved in the affairs of others and rarely gets called out.
Tearjerker: The last few episodes, particularly Luke's reaction to Reid's death.
Nancy's death, especially since the character had been on the show since the very beginning.
Unintentionally Sympathetic: Julia Lindsay, the Betty to Jack's Archie and Carly's Veronica. After several months with Jack, she leaves him when she realizes that he's still in love with Carly. After Carly leaves Jack at the altar, he goes running after Julia—who rebuffs him as (a) she's trying to get on with her life, and (b) she (correctly) suspects he isn't over Carly. He spends months courting her and convincing her otherwise. She finally gives in, only to have Carly resurface on their wedding day, and for Jack to promptly begin mooning over her at every opportunity, ignoring his wife. . .and ignoring the fact that all this is slowly driving her insane. When she miscarries and he dumps her right afterwards, it's the straw that breaks the camel's back. Basically every terrible thing that Julia does afterwards is clearly made to make the viewer feel sorry for Jack and Carly, but given their abhorrent treatment of her, it has the opposite effect. Not until Julia kidnaps and rapes Jack (desperate to replace the child she miscarried) did viewers sympathies shift.
Wangst: Janet who whines whenever Jack pays attention to someone other than her.
What An Idiot: Luke got jealous when his (gay) boyfriend spent time with his ex-girlfriend and retaliated by making out with his grandmother's husband.
Chris Hughes suspects he may have a heart condition, and because he didn't want his family to worry, ropes Reid (a neurosurgeon) into helping him out. Reid even tells him it's stupid and he should see a specialist about it, but he lets it get too far, and ends up needing a new heart.
When Dr. Oliver tells Noah not to bring Luke to the hospital because he's annoyed by him, Noah decides to break up with Luke, which caused Luke to think that Reid had a problem seeing the two of them together.
The Woobie: Luke. He's also the only character (beside Noah) who ends up alone in the Grand Finale. Despite being a very Nice Guy, he gets into horrible situations that are not his fault and became an alcoholic at 16.