When Hawke flies to Nassau, Bahamas, the plane in the air is a Pan Am Douglas DC-8. On the ground, it is a Pan Am Boeing 707.
Hawke arrive at a New York City adjacent airport on the day before Christmas - traditionally one of the busiest travel days of the year - yet appears to be only traveler in entire terminal. Hawke also takes leave of Frieda on the deck of an ocean liner taking her to England and there is nobody else there either.
When Ferdie's date is warming her behind on the heat of the fire in the fireplace at Arthur's cabin in Kentucky, her mouth movements, at one point, do not match the audio dialogue.
At the party when Fannie takes Hawke over to meet Frieda, Fannie is talking but her mouth is not moving - the dialog obviously dubbed in post.
When Frieda called Georges from Hawke's apartment, she only dials five digits instead of seven, as would have been necessary at the time.