Hank and the Great Glass Elevator - S5-E11
Continuity mistake: After the banquet dinner where Bill sees Lenore, she comes to visit him at home. They are sitting down on the couch and when she's talking she has her hand on his chest and you can see there is a pen in Bill's right shirt pocket. Between shots she talks about stealing Bill away at the prom and in one quick shot the pen disappears and the next shot it returns. Also look at Lenore's hand in this scene. It goes from being next to his chest, away from his chest back to being on his chest.
Continuity mistake: When Peggy says that Bobby could have invited her and Hank to the dog house, Hank says that they wouldn't have been able to fit in the door, but he went in and out of it earlier while fixing up the doghouse. At the end of the episode, Peggy is inside the doghouse with a student she is tutoring.
Answer: Jeffrey Boomhauer is a Texas Ranger as can be seen in the final episode at the end when he sets his wallet down, it flips open revealing a Texas Ranger badge.