I visited the Mammoth Cave Wax Museum in April -- the woman in the last display is indeed Dolly Parton who has, according to the audio narration, "Already made her motion picture debut" and is "well on her way to being a star".
Time hasn't been kind. The figures of John L Sullivan (who was included in a display with Teddy Roosevelt, Henry Ford, and Thomas Edison) and Groucho Marx were missing, even though the narrator still tells us about them. Roosevelt was also missing a big chunk of his finger.
The place is kept clean, though. The only noticeable dirt was a huge cobweb between the heads of two of the disciples in The Last Supper display.
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