When Mac goes to throw Peter, who is behind him, he starts to twist to his right to grab Peter's right arm. After the cutaway, Mac's stuntman is shown tossing Peter's stuntman over his left side.
When the butler/enemy agent Hansen confronts Duncan MacLean loudly playing the organ in the middle of the night, Hansen ruffles his own hair to appear as if he has been sleeping and just awakened - clearly forgetting that MacLean cannot see his appearance.