There's always something that slips past an editor's eagle eye - nobody's perfect. Something that is, basically, a cock-up...
Take Countdown #14, for example...
First you have your generic faceless stormtrooperssoldiers of Monarch's army attacking an outpost held by Earth-51's Monitor, Earth-51's Batman and the new Red Robin (our Jason Todd). Only in comics would that sentence make sense.
Then you have Earth-51's Batman (even more of an arrogant ass than plain old Batman) acting all cocky and smug:
Now, let's turn our attention to Red Robin who's having a snark at Batman when something happens out on the - hey -
- that's not Red Robin - he's colored as Batman even though the dialogue clearly makes him out to Todd.
D'oh!