In the lines "You never see the real thing / You can't tell it from the fake," the phrases "real thing" and "fake" are sung to pitches that are roughly an octave apart ("real thing" is sung to A G, and I think "fake" is sung with a melisma, to Bb G), so the large interval between the pitches emphasizes the contrast between "real" and "fake," despite the narrator's claim that the two are indistinguishable.
When I found the specific notes, I also noticed that the Bb to which "fake" is sung is an accidental in the song's G major. In a way, this foreign tonality illustrates the word's meaning.