According to an interview following the shoot, Kate Winslet admitted that in the urination scenes there was bag taped to her leg to pull off the effect. Finally she got frustrated and asked Jane Campion if she could just urinate herself. Campion did one take this way, but the urine was harder to control than Winslet had thought, and the take was scrapped.
When at first Ruth is in the middle of a circle of her relatives, she has a jewel in the middle of her forehead. Then the jewel disappears for a while and then reappears for the remainder of the scene.
When PJ is driving in the red outfit, he is on the left-hand "driver" side. When the lady gets in the car, he then has switched to the right-hand side (still driving). The lady is then in the left driver side where PJ was originally.