Remember the point someone rose that The Ending could have been filmed during the filming of Series 2, so that there would be no excessive paparazzi attention (and they could sneak JS in)? Well, here's something, that backs it up. Or just is a bit of a lovely A2A trivia (:
Mason Kayne, the Ghost!cop boy appears in 2.3 as an extra in the scene in the bar. Could have been there for a reason, could have just stuck till the end (:
Kayne piccie from IMDB, as a link, cause it's massive
http://ia.media-imdb.com/images/M/MV5BMTgxMDcyNjE5MV5BMl5BanBnXkFtZTcwMzIyMzg0Mg@@._V1._SX640_SY938_.jpg 2.3 screencaps: