Audio problem: After the manager of the Wichita Falls propane store & his son start feuding with Hank about the Dallas cowboys, they start singing the theme of the Sooners football team. Hank starts singing the cowboys theme and they all try to outsing each other. When they do you can see that the son's mouth doesn't match up with what he is shouting particularly as Hank is about to leave the store.
King of the Hill (1997)
1 audio problem in season 3 - chronological order
Starring: Brittany Murphy, Pamela Adlon, Mike Judge, Kathy Najimy, Johnny Hardwick
Returning Japanese (1) - S6-E21
Plot hole: In this episode, Hank meets his paternal half brother. They look alike. However, we saw in an earlier episode that Hank's facial structure takes after his mother, not his father. Since they are paternal half brothers, then the Japanese brother cannot look like Hank since he has a different mother.
Dale Gribble: Boil up some Mountain Dew. It's gonna be a long night.
More trivia for King of the Hill
To Sirloin with Love - S13-E20
Question: What is Boomhower's occupation?
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.