Caught it the first time I saw it in theaters....and glad to confirm it on the Blu-Ray.
In like the second shot of Gotham after the nuke goes off, basically in the middle of the shot there is a "Philadelphia Phillies" banner hanging in the window in the middle of the screen. Noticed by the white Phillies "P" on the field of red.
As a die-hard Phillies fan, this continuity error (a Phillies flag in Gotham) is fine with me. (I know there could be a Phillies fan in Gotham...but really).