Ruth Dietrich is billed onscreen as "Miss Patterson", but it is secretary 'Mary Treen' who is called by that name several times.
Junior signs his first name "Frederick" but the ship named after the expected next Osborne heir spells the first name "Frederic."
When Senior is talking to Carlos just after his discovery, the light coming through the window falling on the wall behind him is moving to reflect the rolling of the ship. However, the light on the wall behind Senior, presumably coming from another window by its appearance, is not moving.