These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Even though Parton released it three times, many people still believe that "I Will Always Love You" is a Whitney Houston song. Among them, Dolly herself. She will happily admit if she's "lost" a song, and she says that while she might have wrote it (and had a hit with it herself,) it's now Whitney's song.
"Old Flames Can't Hold a Candle to You" was first released by Joe Sun.
And a few country fans think she wrote "Shine"...
She Really Can Act: A big part of her success comes from looking people expecting her to be a Dumb Blonde only to realize she's actually highly intelligent and a very talented singer and actor.