The stereo track contains the original mono. The songs have been dubbed in from the original masters (since the same thing was done originally.)Nope. It was around 1982 that they substituted the stereo masters of the Beatles music tracks for the original mono versions. The absence of an isolated sound effects track at the time is why they lost some of the foley effects during the songs. They have re-added the foley in the new awkward 5.1 mixes of the songs, but they should have just included the original mono track for the whole film.
The original mono was released on video more than 20 years ago (today ), and has not been on video since. The AMC broacasts of the Paul Rutan restoration apparently featured the complete original mono soundtrack, but the subsequent (and short lived) MPI DVD still had the stereo version except for the foreign language tracks.
Regards,