smg was originally cast as cordeilia, and charisma carpenter auditioned for buffy. willow was played by riff regan in the pilot episode, but was recast because she had no chemistry with the other leads. you can watch that pilot on youtube, but it's hard to sit through. alyson hannigan and seth green were in a weird but fun 80s movie called my stepmother is an alien. david boreanaz played one of kelly bundy's boyfriends. al beat him up in a movie theater.