Per what was mentioned before: the B&W playbills vs the color playbills just have to do with money. When a show starts printing playbills in B&W (when they were originally in color), that's usually the first sign of financial woes because the move means they're trying to cut unnecessary costs.
"Mostly, I loved the size of these people's emotions. Nobody has emotions this size anymore. Outsized emotions. Operatic emotions. Kushemski and Vanda are like Tristan and Isolde, they're Paolo and Francesca. Nobody's in total thrall like this anymore. Nobody's overcome by passion like this, or goes through this kind of rage." Thomas, Venus in Fur