Corrected entry: Hank, Dale, Bill, and Boomhauer talk about the fun they had in Cotton's Cadillac when they were kids. However, in the season 5 episode "When Cottom Comes Marching Home", Lane Pratley comes to take the Cadillac away because Cotton is a few months behind on payments. This means that Cotton couldn't have had the car since Hank and the other guys were kids. Lane Pratley is around Hank's age, so he wouldn't have sold Cotton a car back then.

King of the Hill (1997)
1 corrected entry in season 11
Starring: Brittany Murphy, Pamela Adlon, Mike Judge, Kathy Najimy, Johnny Hardwick
It's Not Easy Being Green - S5-E16
Factual error: Boomhauer's car, Ms. Sally, has a Texas flag license plate on it. These plates were not issued until 1992, but Ms. Sally was driven into the quarry in the late 70's or early 80's.
Dale Gribble: Boil up some Mountain Dew. It's gonna be a long night.
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.
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Correction: In the season 3 episode "Nine Pretty Darn Angry Men", Lane Pratley stated "I own Pratley Ford, Pratley Honda and I got my eye on Pratley Cadillac- my daddy ain't doin' so good". Presumably the elder Pratley sold Cotton the Cadillac before his son bought his Cadillac dealership.