I'm of the opinion that life doesn't always tie up neatly at the end of the episode.
Since September 11, security has been increased everywhere, and we have new IDs to get on to the Fox lot. I drove to the security gate, but realized I'd left my ID in my other car. I just broke into that voice - 'Hey, man, I'm Bart Simpson. Who else sounds like this?' The guard waved me through.