not much had changed behind the closed doors

[Vladv1]

"It was only a temporary blip, though; the calm before the storm. By the time the band had begun their first tour of Australia for four years, in February 1981, Back In Black had heavy-stepped it all the way in America to No. 4, beginning a stay in the Top 10 that would last for nearly six months.
Yet while they celebrated back ‘home’ in Oz, with a huge outdoor summer show before 30,000 people at the Showgrounds in Sydney, supported by their Alberts label-mates The Angels and Bon-connected mates in Swanee, not much had changed behind the closed doors of the AC/DC dressing room. BON LIVES! graffiti may have grown like a rash in Australia over the preceding 12 months, but the party held backstage afterwards was all about reinforcing just how amazingly well AC/DC were doing now without their old man. There to see the band presented with 40 gold, platinum and silver records from all over the world were faces past and present: the entire Young clan, headed by George, and Harry Vanda; Peter Mensch; Ian Jeffery; Ted Albert; various members of Rose Tattoo, The Angels, Swanee and the Ted Mulry Gang. Even Mark Evans showed up. ‘It was the first time I’d seen the band play since I’d left them. And here’s the intro, then Brian singing, it was just bizarre! But really poignant, seeing them without Bon. I was in the VIP area and there were two mates around me so they gave me a bit of room. But I was really unsettled by it a couple of times. But if it was difficult for me, those guys lived through it, playing those songs every night, and living through that. What they did and the way they dealt with that transition, man, I’ve got nothing but the utmost respect for those guys. It was so fucking gutsy!".
Mick Wall, "Hell Ain't A Bad Place To Be".

Sorry for the long abstract, just want to make the context clear. I understand the words, but not the logic. Starting with "yet." What does celebrating in Oz and not changing much have to do with graffiti and the the party? Please reword the second abstract. Thanks a lot.

 

[jutfrank]

The word Yet is like 'but', showing contrast. Their working life doing gigs, and the new graffiti on the streets—the outside world—was new, but the dressing room—the inside world, if you like—felt the same.

 

[Vladv1]

For context. Bon was dead by this time, so the graffitti were for the dead person. AC DC were touring with a new singer at the time. Might this bit add something?

 

[emsr2d2]

For context, Bon was dead by this time, so the graffiti were for the dead person. AC/DC were touring with a new singer at the time.

Note the correct spelling of "graffiti" (just one "t") and the correct way to write the name of the band. You must include the slash.
Also note that although "graffiti" is technically a plural noun and can therefore be used with a plural verb, it's much more common (in BrE at least) to treat it as uncountable and use "graffiti is/was".

 

[jutfrank]

For context. Bon was dead by this time, so the graffitti were for the dead person. AC DC were touring with a new singer at the time. Might this bit add something?

Add something to what? Did you understand what I said in post #2?