Yeah, if you leave the sound on the default 2 channel I noticed dozens of artifacts with the sound as I watch films with headphones. Volume levels, synch, redub, dubbing and loads more to catch the ear. Just adds to the film and I wouldn't want them doing a George Lucas® on it and killing what was already there. Plus of course they'd probably actually have to pay the actors to pop back to the studio for a bit of ADR
When I watch films I do tend to actually watch
them so sound is nowhere near as important and with a film like W&I it's really quite unimportant. Just give us the grain, beautifully playful English language, performances, direction, scenary, humour and everything else we expect.