Continuity mistake: The actress loads her 35mm Praktica camera with Kodak film. That's not really strange, but the film is situated in 1968 around the invasion of the Russians in Prague. The film cassette is clearly visible as having DX coding on one side for setting the film speed automatically. This feature had yet to be invented in 1968, because it was released in the early 80's.
Continuity mistake: In the scene where Daniel Day Lewis finds out his dog has cancer, the camera zooms to the dog. The dog has a black nose. In other scenes, it has a pink nose.