The original mix is easy to spot because it will have John’s overdubbed “Roll up! Roll up! For the Magical Mystery Tour…” at the beginning of “Magical Mystery Tour” rather than the recording from the song. It also contains the original mono mixes of the songs.
My laserdisc, and 1997 MPI dvd also has John’s “roll up roll up”. I’m guessing the mono mixes of the songs is the only other difference to the soundtrack?