We do have in the archives partial vocals for "Good Vibrations," from a copy of an original 4 track master. This 4 track (which now exists only in a vintage 8 track copy) only had some of the vocal parts, none of them doubled, and was apparently copied to a separate, now missing 8 track onto which Brian would have then added all of the rest of the vocal parts and layers heard in the final mix.
Thanks for the information, Alan.
Are you saying that tape was actually used for the film? Or just that it exists?