 We see Willow wearing a shirt with a number on it. We then see  Xander come in wearing what looks like a football jersey with a  number on it. Later when they gang is saying goodbye to Giles, Dawn  is wearing a shirt with 07 on it. The crew got many letters asking  what the numbers were supposed to mean, but there was no connection.  Executive Producer Marti Noxon (qv) said that this was completely  unintentional and was just a wardrobe coincidence.