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You’ll sometimes hear Beatles fans referring to a Fab Four record as “perfect.” Given the power of the songwriting, production, and individual performances, it’s not hard to understand what they mean. But from a technical standpoint, band’s recordings were far from perfect.

In some cases, The Beatles intentionally made a recording flawed. Geoff Emerick, the band’s longtime engineer, explained how it worked in the book Here, There and Everywhere. “When someone made a mistake and the others liked it, we’d often make it louder [during mixing] to accentuate it.”

On the Abbey Road album, you find an example of what Emerick was talking about on “Polythene Pam.” In the middle of that track, which was part of the Side Two medley, Paul McCartney made a mistake playing his bass part.

Though he planned to correct it, Emerick and others (including, presumably, Paul’s bandmates) insisted he keep it in the song. And the record went out with that mistake on it.

Paul’s bass glissando went awry during the recording

THE TONIGHT SHOW STARRING JOHNNY CARSON: Paul McCartney and John Lennon of The Beatles visit on May 15, 1968. | NBCU Photo Bank .

If you’re familiar with “Polythene Pam,” you’ve probably noticed Paul’s bass part on the track, especially during the breaks (at 0:20 and 0:41). Paul’s bass, along with George Harrison’s rocking guitar solo later in the song, really stand out on the instrumental side of things.

While overdubbing the part, Emerick recalled Paul “overshooting” the glissando (a technique of sliding between notes). Though he noticed it right away, he got overruled when he said he’d fix it. “No, it’s great! Leave it in,” Emerick said “everyone” told Paul.

Producer George Martin was in on the joke, too, Emerick said. And the Grammy-winning engineer said he and his colleagues looked for ways to make mistakes more prominent. “Sometimes we’d double-track the mistake with different instruments so it would be even more obvious,” he said.

So why were The Beatles going around highlighting flubs in their recordings, you ask? “It was all about playing a joke on the fans,” Emerick said. “Giving them a treat, something to talk about.”

Ringo had trouble with the ‘Polythene Pam’ drums as well

Beatles ‘Abbey Road’ Billboard on Sunset Strip, 1969 | Robert Landau/Corbis via Getty Images

Paul’s minor bass flub wasn’t the only issue during the sessions for “Polythene Pam.” Prior to recording the bass part, John had made a crack about Ringo’s drum part on the song. (“Sounds like Dave Clark,” John said on one of the surviving alternate takes.)

Ringo took that criticism to heart and asked to have another go at the song’s backing track. When John vetoed the idea, Ringo decided he’d put in the extra time later and record the drum part on his own. (Emerick said this laborious process took “many hours” to do.)

In the end, the most obvious flaw in “Polythene Pam” turned out to be one The Beatles meant to be there. True to Emerick’s prediction, people are still talking about it. But that’s par for the course when it comes to nearly anything related to the Fab Four.

Also see: The George Harrison Song That Had The Beatles Rolling Their Eyes in the Studio