Hillbillys in a Haunted House (1967)
The "hillbillys" (sic!) are actually a country singer, his blonde, curvaceous co-star, and their manager. You can tell he's the comedy relief (in a comedy!) because his name is Jeepers and he constantly acts nervous, in a Don Knotts kind of way. They're driving along in one of those big, fancy cars decorated with fake guns and rifles, and a big pair of longhorn cattle horns on the front. They run into a gun battle between cops and a couple of spies. It seems that the local metropolis, Acme City, has a missile plant, and there are spies all over the place. Well, our trio winds up in the tiny community of Sleepy Junction, with no place to stay but the local abandoned mansion, which is said to be, you guessed it, haunted. Down in the cellar are Lon Chaney, Jr., John Carradine, and Basil Rathbone, along with a boss lady named Madame Wong, a gorilla named Anatole, and a bunch of electronic equipment. Of course, they're spies, and are faking the haunting stuff to cover up their activities. A whole bunch of country songs and supposedly comic antics follow. There's also a real ghost, very briefly. The Good Guy spies work for M.O.T.H.E.R. (Master Organization to Halt Enemy Resistance.) The comedy relief gets to say "weirdwolf" for "werewolf." The biggest country star in this thing, Merle Haggard, shows up on the television the three dragged into the mansion. After an hour of this nonsense, we get a full twenty minutes of a country music concert. The End. Amazingly, this is actually a sequel, to the equally misspelt Las Vegas Hillbillys.
Oh, man. Ferlin Husky and Joi Lansing? I recall Lansing as a TV equivalent for Marilyn Monroe, and rather less annoying than some other MM imitators like Mansfield and Van Doren. This wasn't her first foray in hillbilly territory, either. I remember her from The Beverly Hillbillies and IMDB reminds me she played Lester Flatt's wife. Husky was maybe best known for the song "Wings of a Dove," during which his twang was occasionally punctuated with a throb, as I recall. Mostly I remember the name from all the ads for Time/Life CDs of the old Country hit songs.