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.
Anvilicious: Practically every case that Regina comes across in Season 4 has to do with parenting or children. She had just happened to become pregnant, and was having some serious doubts about it.
Seasonal Rot: Season 4 verges on it with a weak Detectives' season arc but is held up by the partnership of Cooper and Tang and how it collapses. Season 5 is generally considered weaker than the rest, however.
Shocking Swerve: the ending to episode 3 of season 3; we learn that Sherman's mother wasn't actually being raped when his front teeth got knocked out, the sex was consensual as she was doing it to pay off Ben's father's drug debts. I mean really, who saw that coming?