Nearing the end of King of Comedy, when the show that Rupert "bought" himself into starts, there's a writer with his family at the (back?) entrance, supposedly one of this evening's show guests. But to his surprise he isn't actually on the invitation list and starts to argue with the porter, until he just runs into the studio, alarming the guards thereby. This confusion is used by Rupert to sneak into the studio.
But I didn't quite get what the background of this incident actually was, especially since the writer is then further questioned by the guards about his background, all of which seemed rather unrelated to the rest of the story. Sure, it provided Rupert with a way to sneak into the stuido, but had he just introduced himself as "The King" they would have had to let him through anyway. And it seemed quite a coincidence and unusual event to be entirely unrelated to the story at all.
So what is the actual background of this incident with the writer and his supposedly lost invitation that further ties it into the rest of the movie's story? Was this really just some totally unrelated coincidence (or maybe he was just supposed to be dropped by the changed program due to Rupert's shenanigans)? Or was that maybe even facilitated by Rupert himself somehow in order to silently sneak into the studio (but why would that have been necessary)?