Keira Knightley was upset she couldn't pick up the dance moves in Anna Karenina.

The British actress - who plays the title role in the Joe Wright-directed film - found it frustrating when she couldn't pick up the intricate and elaborate routines in the film, whereas her co-star Aaron Taylor-Johnson had no problem at all: "I think I'm quite good at picking things up and I found this impossible and Aaron could just do it in about five seconds. It took a really long time."

However it was not all easy for Aaron, as Joe revealed he was sick during the shooting of the dance scenes. "One day when Aaron was actually ill, and there's a bit in the dance when he has a really red face, he was trying not to be sick," Joe added.

Much of the film takes place in a theatre which constantly changes scenery, despite Joe thinking he was a much more "on location" kind of director. "I always thought I'd be the kind of filmmaker who dealt predominately with real locations, but I find more and more that I like creating spaces in which to play out our dreams. Often there are quite critical limitations put on filming in these locations, so it was interesting," he said.