This may be more studio than what Wire Chief had in mind, but I thought it worth including. The chord progression at the end is wonderful. It contains a chord of interest to music theorists. The song was used as an example of the chord in theory class. Based on googling and seeing the progression it looks to be the fifth chord. Looks to be a minor triad with a minor seventh, in first inversion. Guitarists might see it as a minor triad with a major sixth, I don't know. The chord dates from the late 19th-century and probably had a special name, but alas, well, it's been 40 years. It might be from the family of chords of which the German augmented sixth is an example.
The guitar solo in this song is sort of famous, or infamous, in the context of The Carpenters. Reportedly they got hate mail from fans upset that they were diverging from their soft-rock roots.