Frohike, when doubtful of Adam/ Charlie's story, says he's not quite ready to call Mulder. At this point in the X-files universe, Mulder was just returned by the aliens and presumed dead.
After being attacked by Adam, Langly comments that lots of things set off Adam, including "Midgets" but the fact that Adam is set off by his memories of the Dwarf Santini won't be established for several more minutes.
Outside Maniac Marvin's store, supposedly in Washington, DC, we see a trolley or electric bus going by. They didn't have either in DC in that year.