In his appearances as The Joker, Cesar Romero's moustache is visible under his makeup. Romero refused to shave it off, so his makeup had to be applied over it. See more...
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Tsk. After all his lectures to Robin about the importance of education, Batman should and would know better. On the chalk board, where he's written out Joker's message (dictated to him over the phone), the caped crusader mis-punctuates the phrase "a gargoyle's key" by leaving out the apostrophe. Definitely not a mistake that stickler-for-correctness Batman would make.