Being able to undo watched for a show or movie you accidentally click 'I've watched this' on.
See first reply.
Thank you very much for a response and clearification!
You can do that already. either from the episode page itself when you expaned the "view details" and hover over the scrobble/checkin/watched timestamp of your choice and click delete or from your history page when hovering the episode: http://i.imgur.com/oeDBCp0.jpg