When Sam and Ruby look at their reflections in the big window, Sam's face is partly shadowed in the reflection but when the shot is on him his face is fully lit with no shadows.
When Sam is telling Ruby her name, she is looking to her left. The film cuts to Sam and then back to Ruby and she is now looking to her right.
When first seen at the Scrabble board, Sam's face is in full light in the close-ups, but lit from his left with shadows on the right side of his face in the medium shot.
As Sam slowly reaches over and closes his dead father's eyes, we can see his father's shirt rising and falling with his breathing
Sam's father has a plaque outside his surgery noting him as an 'M.D.'. In Australia, doctors receive the post-nominals 'M.B., B.S.' (Bachelor of Medicine, Bachelor of Surgery). A doctor with a M.D. has received a much higher degree and is unlikely to be practising as a General Practitioner.
Sam's business card has him as 'MB. B.S. F.R.A.N.Z.C.P.'. It should be presented as 'M.B., B.S. (Melbourne - or other University name), F.R.A.N.Z.C.P.'.