Revealing mistake: Whenever Isis has to do jumps you can tell it's not her but a stunt double.
Continuity mistake: After Nicky has been separated from her parents, Nicky and her father are walking the streets looking for each other. A horse and cart with lots of children on the cart and a line of children walking behind it goes past Nicky. She sees her father walking on the other side on the road, but when she walks behind the cart to cross the road, the camera angle changes, and the children have changed places in the line.