(at around 54 mins) In the kitchen scene where Anna cuts herself with an electric knife, Mark picks it up and starts slicing his left arm multiple times. The next day, he is in the kitchen again with his sleeves rolled up, but there are no cuts on his arm. Given the surreal nature of this film, this could have been planned. The camera focuses on the supposedly sliced arm. One can only speculate what message was intended, if in fact the "gaff" was intentional.