Doctor Who: 14 Cool Details Revealed In Steven Moffat's Wedding Of River Song Commentary
10. Upside-Down Dorium Was Shot In A Simple, Yet Clever Way
When the Doctor takes Dorium's boxed-up head back to the TARDIS, the head has been turned upside-down, which Dorium takes surprisingly well, all things considered. If we were in his metaphorical shoes, we'd definitely be doing a lot more complaining.
Dorium's upside-down head was filmed by turning the camera itself upside-down, and then getting Fisher-Becker to lie on the floor with some green material around his neck. This green was then keyed out in post-production, making it look as though Dorium's head had been severed.
A simple - yet effective - technique!