Dan mentions he "came down near the Circle Star". The Circle Star Theater was a performing arts venue in San Carlos, California (near the county seat of San Mateo County, Redwood City and south of San Francisco). Its name derives from the fact that it was a "theater in the round", featuring a rotating circular stage and there wasn't one bad seat in the house. The Circle Star was demolished in the mid-1990s to make way for some dot-com businesses, all of which are now defunct.
Dan's 2007 cell number is 415-555-0177. Katie's is 415-555-0156. While the 555 prefix is standard practice for TV shows, logically there could only be around 10,000 phone numbers. The population of San Francisco circa 2007 was around 800,000.