Peeve #1: current styling (and possibly bean counting) over functionality & safety has many manufacturers integrating the turn signal and headlight into a single unit.
Isn't it obvious that physically separating the two light sources increases visibility of the turn signal through greater contrast? And thus safety? Duh.
Guilty:
Peeve #2: (somewhat related). Manufacturers who place the front turn signals inboard of the headlight. Ford comes to mind as particularly guilty of this mistake.
Makes it impossible to see signals in a "line" of approaching traffic until either you or the approaching car are close enough (too close) that there's an unobstructed sight line to the signal light.
VERY Guilty: