If you remember a cute brunette named Brianne Leary, who did a season on "CHiPs" (1978-79,) I believe she was the only person to ever be a contestant AND serve on the celebrity panel later.
KDFW was gracious enough to not pre-empt "Match Game," especially since MG was near the end of the CBS daytime schedule for the day...and many affiliates used the 2:30 and 3PM slots for "Merv," "Mike Douglas," "Dinah!" and other syndie properties that usually ran 90 minutes and could otherwise disrupt a schedule full of early newscasts. That may have been the case with KHOU. Now KDFW did indeed dump the network's 3PM offerings in the 80s, which is why we never got the 1982 version of "Tattletales," or Tom Kennedy's "Body Language" or the last few months of "Press Your Luck" in DFW. After PYL was canned for good, I believe that's when the network gave back the 3PM slot to the local affiliates for good, c. 1986.
We did miss the very first month of "Match Game" on KDFW in July 1973; can't recall why it was pre-empted.
FYI, here's the DFW lineup of "evening fringe" programming over time:
1975:
KDFW-Mon "New Candid Camera," Tues-"Sea Hunt," Wed-"Last of Wild," Thurs-"Young 4 Country," Fri-"Thrillseekers"
KXAS-Mon and Thurs "Let's Make a Deal," Tues and Fri "Hollywood Squares," Wed "Price is Right" (and at some point later, the "$25,000 Pyramid" with Bill Cullen was added)
1977:
KDFW-Mon "Match Game PM," Tues "Let's Make a Deal," Wed "Young 4 Country," Thurs "Bobby Vinton Show," Fri "Candid Camera" (and later in the 77-78 season, KDFW dropped all of these and went to an extra hour of news at 6:30)
KXAS-Mon "Muppet Show," Tues "Family Feud" (which went to both Tues and Thurs later,) Wed-"Price is Right" (Bob Barker replaced Dennis James in the fall,) Thurs "Hollywood Squares," Fri "Name That Tune"
WFAA-"Bowling for Dollars" with Vern Lundquist
1982:
KDFW-"Family Feud" (all week)
KXAS-"Entertainment Tonight" (all week)
WFAA-"PM Magazine" (all week)