Inevitably with Adam West taking a role in the game, there is some game-play for the classic 1966 Batman, which isn't restricted to the 75th anniversary expansion pack. If you go to the Batcave's Main Room and then take the Bat-logo elevator to the trophy room, you can fly all the way to the right to discover a studio set, which is clearly based on the '66 version of Wayne Manor. If you then switch to Batman, and use the grapple gun to point to the left of the bookcase, a secret passage will open. Jump onto the poles and there's a secret bonus level celebrating the 1966 show, and a linked Achievement (pleasantly called Same Bat-time! Same Bat-place! for an added nod).
