There’s been some speculation on the Steve Hoffman music forum and elsewhere about the amount of screen time that was taken up by the barbershop quartet in the ‘Maxwell’ animation. I think it was only a few seconds. Someone from Dig Media tweeted on 10 November 2019 that the animation cell signed by the Beatles was the closing frame of the clip. I think the first 3 minutes of the animation featured Maxwell and his victims, and then the final few seconds showed the barbershop quartet singing along to the ‘silver hammer man’ choral section at the end of the song.
This fits with my memory as far as it goes together with the animation of the silver hammer coming down on “bang bang”
Recently, I listened to an edition of ‘Everett is Here’ (BBC Radio 1, 13 September 1969). In this show, Kenny Everett gave ‘She Came In Through The Bathroom Window’ its first ever radio spin and then he announced details of the ‘Abbey Road’ special:
…and this coming Friday, on the 19th, Late Night Line-Up with Miss Joan Bakewell who will be discussing the album and playing every track …EVERY TRACK! Late Night Line-Up, 10:55, 19th September, in which she’ll be asking questions like, “Yes, terrific tune and wonderful words, but don’t you think the specific influence of such a paradox does make one a little aware of the transient peripherals?” to which John Lennon will probably reply, “Oh aye, there’s no telling y’know.”
My transcription doesn’t capture Everett’s funny delivery, so I recommend listening to the show on Mixcloud.
I imagine some viewers were disappointed by the ‘Abbey Road’ special because it didn't contain interviews with the Beatles.