Likely a reference to the object, which is a piece of laboratory equipment used to contain vacuums. A bell jar was famously used in the Disney adaptation of Beauty and the Beast.

It may also refer to The Bell Jar by Sylvia Plath, which was a semi-autobiographical novel that was published just months before the author’s suicide. It chronicles the protagonist’s spiral into depression, which she describes as being trapped in a bell jar.

It works in the context of the song with him being stuck in a mess (depression) that she knows like the back of her hand.

As with “November Spawned a Monster”, Morrissey chose to write about a subject somewhat taboo in pop music: male prostitution, specifically around Piccadilly Circus in London. The title of the song refers to the cant slang language polari, first used by male prostitutes in the 19th century and was then taken up by homosexuals in the 1960s to disguise sexual predilections which were illegal in the UK until 1967.

The polari used in the chorus came to national attention during the run of the popular BBC radio show (1965–1968) Round the Horne which featured the characters Julian & Sandy (Hugh Paddick and Kenneth Williams). A gay couple and former chorus boys, Jools & Sand used frequent polari to comic effect:

“Oh hello Mr Horne! How Bona to vada your dolly old eke!”

Bona = good
Vada = see, look
Eek (from “ecaf”) = face
Riah = hair

The Chelsea Drugstore wasn’t open for very long (1968–1971), but its aesthetic appeal – from its sleek modern glass to its crisp aluminum front – was influential to pop culture connoisseurs. Esteemed filmmaker Stanley Kubrick filmed an integral scene from A Clockwork Orange in there.

Heartbreak Hotel was previously just a figurative location to describe Presley’s lovelorn soul, but Elvis Presley Enterprises developed it into a real place– one of the most popular hotels in Memphis, Tennessee.