I've seen Tom Wilson a couple of times at MegaCon. I couldn't believe how funny and nice he was. It's easy to forget that being a jackass was just an acting role, lol. There have been a couple of slightly different variations of that Back to the Future song. Here's another:
And here's a video I recorded at MegaCon several years back of a Back to the Future panel that included Tom Wilson:
Great version of the song.
Watching that last video, I've seen him and Christopher Lloyd together in a number of videos. What I love about Tom is he always seems so protective of Christopher and is quick to jump in and take over whenever he has a senior moment. It's sweet to watch.