I’m shocked and appalled that it’s taken me this long to make a Sky High reference/joke. It’s unacceptable.
It's implied in Animal Man that the REM song "Superman" exists in the DCU. It still totally flows, but how would other songs/movies/etc be changed in the DCU to reflect that Superman's a celebrity and not a fictional character? We know he's licensed his image out to cartoons for charity work, for instance.