Spike's trademark coat cost $2,000 from a top fashion store. It was then run over repeatedly by a truck to give it that distressed look.
James Marsters only read the scripts for his own scenes, as he was a fan of the show and didn't want to have the rest of the episode spoiled for him.
Anthony Head tutored James Marsters in his London accent for Spike. In reality, Head's accent is more like Spike's than the clipped English tones that he sports in the show.
Sarah Michelle Gellar purposefully kept out of the spotlight during filming, so that younger viewers wouldn't see pictures of Buffy drinking or smoking.