Several times throughout the movie people are picking up musical instruments and music is heard as if they are playing them but the fingerings don't match up with the notes, or sometimes no hand manipulation is done at all, just the appearance of playing the instrument. In one case, Eaglet is playing the flute and plays it horizontally when it is the vertical kind.
There are several instances where continuity is broken (e.g., Valerie's hair and shawl change from the closeups to the wide shots in the first scene), but this was likely intentional. The lack of continuity helps with the surrealism.