The Thirteen Doctors sequence is the crowning glory of the 50th Anniversary. It restores Gallifrey to its rightful place in the Whoniverse, its the first appearance of the Twelfth Doctor, and its the first time in Doctor Who history that all thirteen Doctors come together as one. As a dramatic set-piece, it is absolutely flawless. Nearly. Matt Smith makes another appearance on this list in a technical error, with the cock-up of leaving his script on top of the Tardis console in shots where its clearly visible. A goof thats shared by the production crew and the editors for not doubling back and reshooting those scenes or editing around them. Particularly since the absence of the script in several shots suggests that the crew were alerted to this problem and either didnt decide to replace what had already been shot, or did reshoot and handed the footage to the editors who then made the error of using the footage that includes the script.