When Porbus, Nicolas and Marianne approach Frenhofer's house for the first time, as they cross the street their shadows are towards the camera, but when they walk up the stairs, their shadows are now in front of them - a turnaround of about 135 degrees.
In Frenhofer's studio, the position of Marianne's legs changes between the long shot (right leg bent and forward) and close shot (left leg bent and forward) when Frenhofer is telling them that they will be unhappy as well.
At the 2:13 mark (blu-ray edition) - as the camera begins to slowly close on Marianne settling on the couch, a mic sneaks into bottom of frame.