Not to mention: Alfred back from the dead; the Yvonne Craig Batgirl; Isis showing up in the 70s Shazam comic; Wonder Woman going back to WWII adventures during the Linda Carter series; John Stewart returning to JLA right about the time JL cartoon was airing; etc.
Marvel's been a bit more immune to it, largely because they've had less adaptations and the ones they did have were crap for quite a while, but you have had: Herbie the robot showing up in Byrne's FF; Firestar; organic webshooters; the return of Steve Rogers; etc.
