The bit about Lois moving the car reminds me of the episode where Clark shoved Lois's jeep sideways into a space he couldn't have parked in because the vehicles on either side were not centered in their spaces ("When Irish Eyes Are Killing" I think). And, like Ann, I think that the Gothic flavor of the shop has much to do with the upcoming plot.
For those who aren't Buffy-literate or who don't speak Spanish, "La Boca del Infierno" literally translates to "The Mouth of Hell" or Hellmouth, which has massive significance in the Buffy-verse. (I only wish I knew just what that was.) It calls to my mind an image of Hell slurping down its victims wholesale, and Sunnyvale seemed to be a place where that happened a lot.
Marcus is right that non-Buffy readers (like me) will have to learn on the job, as it were. But don't let that stop you, Shayne. I'm getting everything fine right now, and you're still so very good at leaving us drooling for more.