During the scene where Catherine is about to be injected with morphine, he doesn't fill the syringe properly, the plunger staying at the bottom. Then it suddenly switches to a full syringe with the plunger fully extended.
A very large red or orange drawbridge between two docks can be seen through a window behind Richard Widmark. At 35:33 it can be seen moving slowly to a fully vertical position. At 36:26 it is back down between the two docks. At 37:29 it starts to rise again from the horizontal position. At 37:48 it is back down between the two docks. These timings are from the British DVD.
When David burns alive, the stunt performer's head and hands are clearly covered with a greenish protection headpiece and gloves.
Catherine says that she was raised by the church since she was a child. But apparently she still had time to sit for fashion headshots.