 The scenes in the McDonalds were all shot in City of Industry in  California (just outside Los Angeles). The set was an actual  McDonalds that was built specifically for filming television  commercials and for crew member training. It has never been open to  the public! When McDonalds (or movies, etc.) isnt using the  location for filming, it is locked up behind a chain link fence.  Everything works in the restaurant, but from its construction until  it was torn down it never served a single paying customer.