Various sources are getting their hands on what appears to be the script for Judd Apatow’s upcoming film about stand-up comedy, Funny People, starring Adam Sandler and Seth Rogen, among many others. Here’s an odd find from said sources: Apparently, Apatow has written in a cameo for Bruce Springsteen to be a fantasy mentor to Sandler’s comedian character (The Playlist, via NY Mag’s Vulture). And yet, Springsteen already has fulfilled this mission in a film that centered around music, or have we forgotten High Fidelity? I know Jack Black never will…