To stir things a little bit up: I did some fiddling with the videoclip and also with the mono cd-version of "Pet Sounds" (release from 1990).
First: the audio quality of the video clip was poor: 64 kbps, 48 kHz, stereo. I had to extract the audio from the videoclip and converted it to a WAV-file, cd-quality (44 kHz, 16 bit stereo).
After that I grabbed the mono track of GOK from the mono cd.
Then I downconverted this track to the same poor quality as the videotrack. After that I had to convert this setting back to audio-cd quality so I could compare them.
And the result can be found here:
http://www.yousendit.com/download/WTNJUGhYQzN3TGg1VEE9PQThe first audio you hear is from the videoclip. The second part is taken from the mono cd.
Now, please tell me if there's any difference?
P.S.: the part on the mono cd starts at 2'12".