My best guess? Fox or Todd-AO provided Capitol with more than one set of tapes in 1960, perhaps with the 3-track being a "fallback" in case anything needed a touchup, rebalancing, etc. Whatever happened, I don't see how the original stereo mix -- with Sinatra and MacLaine locked into the same space (just right of center), but with the orchestra in full-width stereo -- AND the 1989 and 2002 remixes -- with Sinatra and MacLaine in different stereo locations, but with the orchestra in full-width stereo -- came from the same 3-track source tape. If Fox/Todd-AO provided "finished mixes" *and* a 3-track tape in 1960, that would jive with all the mix oddities, including the different edits and the lack of the weird "click" sound in the 1989/2002 remixes. It could also explain why the vocals on the 1960 Can-Can stereo LP tracks are slightly right of center, something which is not typical for Capitol's in-house mixes. Well said!