James Garner (Red Stevens) claimed that "The Ultimate Gift" would be his final film. Ultimately, Garner has appeared in the credits for five more films since "Gift".
During the ceremony in Ecuador, while the village elder is giving a toast to Jason, the positions of the two women with painted faces change from one shot to the next.
When Jason sits on the bench in the park, you see the shade of the bench on the left of him. After the wanderer speaks to him and the camera goes back to Jason you don't see the shade of that bench.
(at around 23 mins) Jason has been talking to Mr. Hamilton when Mr. Hamilton turns away and leaves. Jason looks to Miss Hastings to ask where Mr. Hamilton is going. Jason looks right of Hamilton, but Miss Hastings is left of Hamilton, meaning Jason has asked his question to an empty chair and a blank wall.
Stranger: [reading Charles Dickens' A Tale of Two Cities]
"It was the best of times, it was the worst of times; it was the age of wisdom, it was the age of foolishness..."