Doctor Who: 14 Cool Details Revealed In David Tennant's The End Of Time Part One Commentary
13. This Stained Glass Window Is Partly CGI
Right at the start of the episode, Wilf goes inside a church and spots a beautiful stained glass window that, curiously, features a blue police box in its lower-left corner.
Now yes, there isn't actually a real stained glass window that has a TARDIS hidden away in the corner (not that we know of, anyway), but interestingly, most of the window seen in this shot is actually real - it's just the TARDIS bit that's CGI.
That's according to Lyn, who says that The Mill (the visual effects company that worked on NuWho until 2013) took a real stained glass window and "painted in" the TARDIS over the top. And they did a cracking job, we must say.