Although credited, Rhona Mitra (Tara) does not appear in this episode. She does say the "Previously on the Practice" bit and is seen in the previous scenes.
Lucy was mentioned but not seen in this episode.
Willam Shatner was originally scheduled to appear in the last 6 episdoes of The Practice, but for some reason was not written into this one.
The hockey assault video: One hockey player comes from behind and punches the other, who then falls down onto the ice with the puncher on top of him.
This is an obvious recreation of the Todd Bertuzzi and Steve Moore incident between the Vancouver Canucks and the Colorado Avalanche. Bertuzzi punched Moore from behind which set off a fall that subsquently fractured Moore's neck. The incident was investigated by the Vancouver PD, but no assault charges have yet been laid.