It said Robert Byrd was the senator from Massachusetts. that is not correct he was the senator from West Virginia. If they have one thing wrong. I wonder what else there is.
The state from which Robert Byrd came is hardly a controversial or particularly significant point in the video. Yes, the error should be corrected, but no, it does not invalidate the main point of the video.
Interesting that you'd attempt to cast a pall of doubt over the whole video because of one wrong (and minor) factoid.
What's your opinion of the central thrust of the video?