Re Sheff - Alex Turner's side-project, Last Shadow Puppets' last album contained a song called The Dream Synopsis that namechecks "Sheffield City Centre". Jarvis played it on his 6Music show and said something like "Hmm, he's managed to put Sheffield city centre in a chorus better than me!" or words to that effect.

Re supermarkets - the one in Common People is probably the most important one of all.

Re Seppy's obsession with moons, stars, suns and weather... did that Scott Walker mixtape given to JC in the late 80s predate the lyrics written for Separations? We might find out in Good Pop Bad Pop Part II. If they were, maybe this is a tenuous link but it's clear that by then Jarv had a new hero who sung beautifully of...

The Sun Ain't Gonna Shine Anymore
Turn Out The Moon (and the stars in the sky) -  the chorus music of Birds In Your Garden also seems to be lifted from the chorus on this a little*

It's Raining Today
Lost In The Stars
Sunshine/Ain't No Sunshine/Sundown/Walking in the Sun/Delta Dawn (all covers!)

to name but a few.

*Speaking of Walker lifts, one of my favourite songs of his is Always Coming Back To You from Scott 1 and the line "I kissed your eyes awake" from Birds In Your Garden is surely a (sub)conscious steal from "When you kissed my eyes awake" from this track.

Interestingly, the line "Now like children in the dark, we hold hands and watch the rain" on the same song sounds like it would fit perfectly on a ballad from Freaks. Or even as an addendum to the Freaks subtitle  "Ten stories about power, claustrophobia, suffocation and holding hands".