The original does not have a 12-string, but features the banjo. I like both versions. The Rooftop singers version was many people's introduction to the 12-string guitar. Bill S. was a lefty and the matching Gibson 12-strings pointing in opposite directions with a pretty blonde in the middle looked really cool.
I believe that Eric Darling was Pete Seeger's replacement in the Weavers, but my memory's not as good as it was.

Murray - I like to insert a diminished chord in the song at this point:

(C)Everybody's talkin' about a new way of walkin'
(F)Do yo wanna lose your(Cdim)mind?