Tom, try this: download with YT downloader, and play it on WMP half speed.
As this is already a slow version, you may see what is actually happening.
Try also to figure out the rhythm patterns and not only the melody.
For instance:in this version there is a lot of triplet notes, i.e. three notes in one beat (instead of one or two) which make it more interesting.
Chris demonstrates this very well in his Lovebridge Waltz lesson.

I've tried that but no use. It's the triplets. I can play the accordion fine, most people think I'm hot on it. I just cannot get the Cajun thing. It makes me want to put the thing away and go back to guitar again. Or join a Polka band... -L-