Doctor Who: 13 Cool Details Revealed In Steven Moffat's Time Of Angels Commentary

Alex Kingston's River Song is a lead character throughout the entire two-parter, but as it turns out, she wasn't always present to shoot her scenes.

At separate points during the commentary, Moffat takes great amusement in pointing out certain shots in which River is onscreen... but Kingston isn't.

The first is the above shot of River wielding a futuristic blow torch gun, which comes roughly a minute into the episode. Throughout this entire scene, there are tons of shots of River's legs, feet, and hands, which clearly made it easy for the crew to get away with using a stunt/body double.

Then, when the scene cuts to a close-up shot of River's eye, Kingston stepped up.

The next example of a Kingston body double comes later on, when River is in the TARDIS with Amy and the Doctor, and we learn more about her TARDIS-piloting skills.

There's a quick shot here of River's back, and according to Moffat (and confirmed by Gillan) this is actually a double. Sneaky.

Gillan also adds that the double learned all of the necessary lines for the scene, allowing the actors to perform the whole thing normally.