The screen shot used for the outside of Deacon's son's birthday party uses the area code 310 for its phone number, which is a Los Angeles area code. A Queens, NY area code would be 718.
Doug reads the mailman's name from his name tag and mistakes it for "USPO", as in "US Post Office". However, the Postal Reorganization Act of 1970 officially changed the name to "US Postal Service"; the name tag would never had read USPO in the first place.