News:Karl Pilkington was not to guest star
Wikisimpsons - The Simpsons Wiki
Many sources stated that Karl Pilkington was to make a guest appearance on a The Simpsons episode in season 23, the last season. However, it seems that for the second time this season, the media, and us included, have made a mistake. The first mistake this season was when everyone thought that deadmau5 will be guest starring, however, we were wrong there.
Karl Pilkington did make a minor appearance though. In the HBOWTIME logo, part of The Ricky Gervais Show was shown, including small cameos by Ricky Gervais, Stephen Merchant and Karl Pilkington. However, Karl was not going to guest star and this was his only appearance on the show this season.