I hate to break it to certain people out there, but "erstwhile" does not mean what you think it means. Not in the definition are things like stupid, occasionally dotty, frequently displays the emotional range of a teaspoon, or anything else. It means former. As in, he "used to be" my friend, but he turned out to be a slimy slug, so I kicked him in the money maker and giggled maniacally whilst he cried tears of blood. (Reading Control Issues at the moment... can you tell?)
Oh my gawd, romance doesn't have to mean drowning in fluff! Save me! Save me!
Newly realized magical creature!Harry is instantly (or at least, nearly) a fully mature (emotionally/mentally), supportive mate. I find this way more difficult to accept than semi-confused.
Stockholm syndrome... really, we need less of it.
The incredible changing eye colour syndrome. To some extent, I like it. But not when the author makes it a point to constantly bombard the reader with instances. Yes, it's cool. But if I already know Harry (or whoever) is upset/angry/lusty/happy, then I don't also need to keep seeing that his eyes have likewise changed. It's overkill.
I must sigh. It's obviously a rule somewhere in a book I never bothered to read, but did you all know that all it takes is once, twice, three times? Strokes, that is, pulling, to make an aroused man orgasm? Honestly.
On the Other Hand:
I'm becoming so exceptionally fond of seeing Harry's stereotypical portkey landings (usually involving sprawling) and subsequent bouncing to his feet like it was just a slight hitch (or he's made of rubber, I'm not sure).
Bonus:
And the award today goes to [censored] in chapter one of [censored], where Harry, upon stumbling over a dying (we presume) Severus, uses the spell Mobiliarbus to levitate him off to the infirmary (presumably). Now, unless Sev has a woody....