In the opening scene Robert rips the page off a calendar exposing the page for Wednesday, April 4, 1940. That date fell on a Thursday. It is the correct day, though, for 1945 -- the year the movie was produced.
When the nurse Elena turns to say goodbye to Robert, the step she's on gives way and she lurches down about an inch or so, with an audible crunch. But she ignores it and the scene keeps going without a re-take.