All of Batman and Robin.
Bob Kane's wife over acting...:"Oh, there's Bruce Wayne!"
Bob Kane missing his cameo in Batman 1989.
Joker dieing.
Joker being the Wayne's killer.
Two-Face over acting, and so out of character.
Riddler's orange hair or pink or whatever it was.
The Sonar suit.
The Clooney suit.
The ice suits.
Clooney.
Chris O'donnel as Robin.
Robin's suit in B&R.
If you're gonna' have Nightwing's suit let him be Nightwing instead of ruining the suit by adding that cape and red bird, it looks better the way it should be plus, Robin should've kept his classic suit, all that time I waited to see him brought to life on the big screen and he only wears the Robin suit for a little bit at the end of Forever.