 The producers originally planned to film the teaser sequence at a Catholic hospital, but the hospital was reluctant to affix a faux gargoyle to the building. Thus, the shot was relocated to Heritage Hall, a noted filming location and former post office in Vancouver. Some last minute scrambling was required when city workmen tore up the sidewalk on the very spot where the producers planned to film the scene. The construction crew reassured the show that the construction would be finished in time for filming. Indeed, the work was finished two hours before shooting of the episode started. Additional exterior shots were filmed at an alley near Bonanza Meat Market. The walls were painted to match those of Heritage Hall, although after filming was completed, they were returned to their original state.
