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.
Foe Yay: Goren and Nicole Wallace, so very much. The reason for her obsession with him is described, at one point, as being because she couldn't seduce him.
Glurge: The dark side of glurge is explored in "Faith" — the murder victim figured out that a girl suffering from Lou Gehrig's disease, who has faced hardship after hardship in her life but pulled through to write an inspiring book about her trials, does not actually exist.
Harsher in Hindsight: In the April 2009 episode "Rock Star", a musician falls to his death in an elevator shaft in a building in Williamsburg, Brooklyn. In November of that same year, Jerry Fuchs, the drummer for various indie rock bands such as !!! and The Juan Maclean, died pretty much the same way in a similar building in the same neighborhood. However, unlike in the episode, where the musician was pushed down the shaft, Fuchs actually fell while trying to jump from a stalled elevator to the next floor. Still pretty damn eerie.
In the episode "Pas de Deux," the villain is a bank robber (played by Charles Rocket) who is suffering from a terminal illness and plans to kill himself along with his unwitting accomplice. The episode was Rocket's last film appearance; he committed suicide later that year.
He's Just Hiding: A common theory concerning Nicole Wallace's death at the end of season 7. Given that the information came from a less than reliable source and since Nicole has faked her own death before, this isn't entirely unfounded.
Another series produced by Rene Balcer, 2013's "Jo", has the actress who played her show up in one episode as a character who most likely is her, but it's never said one way or another.
Idiot Plot: "Betrayed" in spades. A former girlfriend of Capt. Ross, who is also a former cop-turned-crime writer, has a younger husband who went missing along with his mistress. Naturally, she would be a suspect; however, due to both her interference/manipulation of the situation (and knowledge of police procedure) and Ross' himself telling Goren and Eames to back off due to his friendship and blind devotion for her, they have no choice but to investigate other leads and ultimate dead ends, just because of the torch he carried for her all these years. Not only did it stall the investigation and delay the time to discover their whereabouts, but it made Capt. Ross and the detectives by extension look incompetent.
One-Scene Wonder: Johnny Santos from "The Unblinking Eye". In addition to pretending he was James Dean, he was virtually unmoved by being interrogated by the detectives and even acted like he was on an audition... until Goren accurately implied he was gay, in which his bravado finally wore down and he became defensive.
Paranoia Fuel: Here's a Cold Open. Woman at a restaurant with others. Woman goes to bathroom. Woman is stabbed by a complete stranger in the inner thigh which causes her to bleed out in minutes, too fast to even cry for help. Assailant walks out. Cut to the detectives arriving...
Shipping: Goren/Eames has a rather large fanbase. There's fans of Logan/Wheeler (or, really, Logan/his latest partner) as well.
Logan/Wheeler actually had some resolution, however.
Ship Tease: Man, Goren and Eames have a lot of fun posing as a married couple, don't they? There's also an episode where they pretend to be strangers, and he walks up as she's having her portrait drawn by the murder suspect and talks about how pretty she is. Her reaction seems like she's genuinely charmed by the compliment.
The Woobie: Nicholas Durning in "Cold Comfort." He's afflicted with early-onset Alzheimer's, which his ruthless but outwardly loving father has been telling him is an aneurysm. Seeing him in the interrogation room, realizing what his medication is actually for and the lengths his father has gone to to conceal it from him (including murder), is just heartbreaking.
Ben Watkins in "Mad Hops" is another completely innocent person whose life gets destroyed by another's wrongdoing. He's on his high school basketball team, and is not the best player, but is good enough to get a scholarship to a small school in Iowa. As his mother says, it's all he can talk about. Then it turns out his coach, who has fallen for Ben's mother and has been scheming to get closer to her, has been inflating his stats to help him get to college and even killed two people to keep them from discovering it. Ben loses his scholarship, and probably has no hope of getting another.