According to Google Translate, the van really says "Scranton Hallelujah Church".
This episode was Steve Carell's submission for Emmy consideration.
The Michael Scott Paper Company office is implied to be located under the Dunder Mifflin men's bathroom in previous episodes. When Michael, Ryan, and Pam are leaving their office to speak with David Wallace, they take a path through the building on the first floor that seems to corroborate the MSPC is indeed under the men's bathroom.
When Michael honks the horn at 4am to pick up Pam at her house, the neighbor's light turns on a few seconds later and there is someone at the window.
During the initial negotiation, Michael attempts to use the mumbling technique that he learned in The Negotiation (2007).