Complex sentence: The version of "Park the Car by the Side of the Road" that appears on the record was recorded it is a remix (with some re-recorded vocals) of a track released as part of the "Error" single in 1991.
Split into simpler sentences: The version of "Park the Car by the Side of the Road" that appears on the record is not actually from the BTAB sessions. Rather, it is a remix (with some re-recorded vocals) of a track released as part of the "Error" single in 1991.