Watchmen Easter Egg - A World Without Batman??

In the Watchmen Opening Credits When you see the original Nite Owl punching 'someguy' well this person is actually suppose to be Joe Chill who murdered Bruce Wayne's (Batman's) Parents in this scene if you look to the left you can see none other that Mr and Mrs Wayne them selves and to the right on the wall are posters for the comic 'Batman' .
on the right on the board there it actually says 'Gotham' and the opera bills say: "Die Fledermaus" (The Bat)