Boomhauer is missing his left pinky toe, due to an accident while he was in the Order of the Straight Arrow ("Straight as an Arrow").
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In the episode "A Firefighting We Will Go", after Hank blamed the deceased Chet Elderson for causing the fire station to burn down, Boomhauer pointed out that Dale Gribble was the one who plugged in the malfunctioning Alamo Beer sign.
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In an episode where Hank, Bill, Dale, and Boomhauer are stuck in the water because they jumped off a boat, Boomhauer confesses that he dyes his hair ("Hank's on Board").
Hank, Bill, and Boomhauer decide to go track Bug down in order to make amends with his son.
Kahn tells Connie to take the night off from studying; Dale has figured out how to relieve Nancy's headaches on his own, Lucky and Luanne scoop up Gracie and head for the Hills'; and Boomhauer hurries over, leaving his wallet behind - which flips open to reveal a Texas Ranger badge with Boomhauer's name and picture—the first indication of his career ever revealed in the series.