This was something they started on the '99 tour if I'm not mistaken. A stagehand serves cocktails to the backup singers, who relax on a couch and watch the guitarists drink whiskey and play cards. Yes, it's a nod to the painting. I love how on the DVD you can hear Roger and Andy clink glasses before Jon's synth solo starts.

Apparently on the 2002 tour the stagehand came out dressed in a very silly cocktail waiter's costume to the amusement of the performers and audience.

You can also see Andy shuffling the cards when he's not doing anything during SOYCD.

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what do you teach your children about me?
what do you teach your little children about me?
pimp, thug, bling drug lord of the undergrounded kings
how can you be so sure i won't call down the rain?
what do you teach your little children about me?
you point your gun, wait, hide and run. i see it plain