I gather a good portion of us here know and/or remember the stink Barry & Enright made when Price is Right's Check Game had the original name Blank Check.
Blank Check was a very short lived B&E property back in the mid 1970s for a very short time. Price is Right's Blank Check debuted some six years later, but B&E bellyached about Price using that name, and thus Check Game's name resulted from it.
Conversely, Price's Bullseye game (the grocery item game) debuted in 1976, some 4 years before the Barry/Enright Jim Lange hosted "Bullseye" debuted.
I think Mark Goodson was classy enough to just let that go though, but I wonder if he could have made a case.
Similarly, the program seemed to turn a blind eye when the 2007 "Temptation" game show debuted, which was a horrible recreation of "$ale of the Century".