Ah, what the memory jogs...
Fact is, this album is very curious for its mix, which is not always discrete quad (though it sometimes is) but not a 'double stereo' or 'fake quad' job, either. And that has always been curious, indeed, for a non-classical album from Columbia.
So, what is the result? Well, at times, kind of like Dolby Surround, which had wide stereo in the front (often with the usual 'phantom' center channel') to give the illusion of L-C-R front separation) but different, out-of-phase effects and sundry in the rears, which were usually essentially monaural in orientation, but depending on mix and phasing, could offer certain separated sounds, but the quality was inferior to what was happening up front in the main mix.
This album is like that, though there are moments where the rears are properly separated, but even then, there is no consistency to the rears; some songs begin separated to a degree, but then degrade to almost-mono; others are almost-mono in the back speakers anyway. Yet it is not an unsatisfying experience for that; there is ambience at times, but also discrete separation that sometimes stands out but not often enough.
The question is, of course, whether there was an error in mastering, or some strangeness due to the remix itself. Impossible to say, but compared to the original stereo vinyl, it was never quite the same; it's an obvious remix from multi-track sources, but not the 'full quad' one would expect, and certainly not the usual Columbia discrete Q8 sound. The music's good enough to overcome some of the anomalies, but not all.
ED