Factual error: In the opening scene, the Clampetts are driving home from Malibu. From Malibu to Beverly Hills is east. But as they head home, the ocean is on their left, which means they are driving west.
Continuity mistake: In many of the early episodes Miss Jane drives a 1962 Plymouth convertible, but gets out of a 1963 or 1964 Dodge.
Continuity mistake: Mr. Brewster's hair is parted on the left in three scenes in Pearl's parlor and then is parted on the right in one close up. (00:06:28 - 00:06:49)