In Chapter 9, Mandrake and Dr. Bennett get in the car with Lothar driving. Bennett gets in the back, and Mandrake gets in the front passenger seat. But when showing the interior of the car, Mandrake and Bennett are both in the back seat.
In Chapter 12, while Mandrake is fighting with The Wasp, The Wasp's cape is partially torn off, but is once again intact in the next shot. The Wasp's stunt double is obviously a much younger actor than the one playing The Wasp.
The automobile is the archive footage that goes over the cliff in the last chapter is a much earlier model than the one that had previously been involved in the chase.
At the end of chapter three, the announcer states that the 'Wasp' orders that Tommy Houston captured and to throw him out of the speeding car. In reality, Tommy overhears the henchmen's plan and stows away in the rumble seat of their car. As soon as Tommy finds out what he wants to know, he jumps from the car so he can notify Mandrake what's going on.
At the end of Episode #6, when Mandrake's plane is shot down, there's an image of the tail with its nomenclature NC 16039, appearing on the screen in reverse.
When the Wasp drives off near the end of Chapter 12, the crew can be briefly glimpsed in the car window.