Jim-Bob's birth year is 1923, according to previous shows, and he is set to graduate school in 1944, but supposedly he is still too young to enlist in the army but now old enough to have an expired driver's license.
The opening preview sequence is not seen during the show.
In the closing sequence before the end titles while Elizabeth, Erin, Ben and Jason are seen on the porch of the house, a shadow of a crew member moves across the bottom of Erin's dress. A few seconds later Jim-Bob pulls up in his car. As the above mentioned go and see what he has in the car the boom microphone is briefly seen.