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Nicole Kidman was asked to lose as much weight as possible. She went on the hard-boiled egg diet, which entailed having one egg for breakfast and two to three for dinner. This type of diet is not advisable in the long run, as it is unbalanced, unhealthy, and does not provide one with enough calories. In the end, she ended up losing more weight than she originally desired.
Many of the scenes were shot in the Carpathian Mountains in Romania, for example, around the city Brasov or in the canyon of Zarnesti.
According to TIME Magazine, Jude Law had to gain ten kilograms (twenty-two pounds) of muscle for his role on-location in Romania. As there wasn't any regular fitness equipment around, he did so by carrying his personal trainer around on his back, dragging logs, and pushing a tennis-court roller.
According to Ray Winstone (interviewed on Desert Island Discs), the horse he rode in this movie was the same horse Russell Crowe rode in Gladiator (2000), and is called George.