The white rabbit in the film was played by two white baby rabbits. In one scene they were supposed to run through the "pool of blood" but they liked the fake blood made of rose hip tea so much they stopped to drink - and the photo of the rabbit with the rose hip tea on his mouth looked so scary that it became the main motive for the movie poster.
Originally, the film as an adaption of a Shakespeare play was supposed to look historical. But after watching an episode of "Game of Thrones", the director realized she could never make something historical yet beautiful with the limited budget she had - but wanting to have stunning pictures, she decided to set the whole film in a surrealistic, white & black setting to be able to achieve a special and interesting look with a very little budget.