The first Batman movie was probably the best at channeling the Gothic spirit of the comics (thanks to the occasionally wayward creative genius of Tim Burton) and there's a very early homage to the source that is even more overt. When Alexander Knox is heckled by his disbelieving colleagues, an artist hands him a drawing of the bat-man, in order to compound his public shaming. The comical caricature is a funny touch, which could actually distract from the Easter Egg signature of Bob Kane in the bottom left corner of the sheet - the creator of Batman and his universe.