Crew or equipment visible
(at around 28 mins) At the main character's first visit to the "artist's apartment", he stands and looks at a painting (the one of the naked woman lying on the couch). He stands still to look at it and, as the camera shifts from right to left around him, the TV in the background (which is turned off), picks up the legs of someone walking, yet both characters are standing perfectly still.
(at around 40 mins) When Alex is in the ambulance, the paramedic is incorrectly wearing his phonendoscope (the eartips should point forward). Moreover, it's quite difficult to hear chest sounds through many clothing layers (as shown in the movie) so the diaphragm's usually placed directly on the skin.