When the staff moves the copier and rips the carpet, Oscar exclaims the floors are hardwood. Still hopped up on espresso, they proceed to rip up more carpet. However, Oscar already found out that the floors were hardwood when he picked at the bullet Dwight accidentally fired into the floor in S7. Response: Oscar's statements are consistent with seeing the hardwood previously through the bullet hole in the carpet.
Erin mentions that she has never tried espresso before. Yet, in #5.25:Cafe Disco (2009), Michael makes her an espresso.