When Jethro is at the helm of the ship, he spins the wheel to the ship's left and everyone reels across the bridge to the ship's right, indicating the ship is in a hard left turn. However, as it cuts to an external view of the ship, the ship is seen turning sharply to the right.
While driving in search of the Clampetts, Drysdale tells Miss Jane to pull over at the sign Speedboat for Hire. They then pull up alongside the sign.
Given their direction of travel (as indicated by how Miss Jane parks the car) they would not have seek the front of the sign.
Given their direction of travel (as indicated by how Miss Jane parks the car) they would not have seek the front of the sign.
At 17:21, you can see Elly walking by the porthole. One second later you can see her shadow on the blue backdrop.