The two-door convertible that Jane Hathaway and Mr. Drysdale drive through the Clampetts' gate is a different model and color from that in which they arrive at the house (at around 25 minutes).
As Ms. Hathaway and Mr. Drysdale are talking by the car outside the Clampetts' house, the car noticeably has no windshield.
While Elly and Chickadee are talking by the poolside, a wire is visible that is attached to the raccoon.