the other clips here-
http://spectorbass.com/NewFiles/webmovies.html
Steve Bailey's technique for artificial harmonics is interesting- using fingers for both plucking and locating the node point, thus freeing his thumb for plucking a bassline underneath.
re. Quentin Berry's upside-down technique- notice he switches to playing it normally towards the end of the clip-
what benefits does he get from it?
(other than as flashy gimmick....

)