This kind of happened with the last Chris Rock stand-up special. He flubbed the last joke pretty badly, which everyone who saw it within the first few days saw. Then Netflix edited it without making any sort of announcement and made it seem like he nailed it. People were arguing online about him nailing the final joke, not realizing that they were both right in what they saw. It was kind of an interesting study in the power of editing.
You sometimes get this in movies as well where the take that they use in the trailer is different from the take that's in the actual film. Usually it's the same words but with slightly different inflections. It's close enough to always make you wonder.
Pacific Rim is a classic example. The rousing speech in the trailer is so much better than the one in the film.