There should be a separate thread for Buffy connections
More:
Marshall Manesh (Ranjit) guest starred on
Scrubs with Sarah Chalke. He also appeared with Charlene Amoia (Wendy the waitress) on
Joey.
K Callan (Lily's grandma) guest starred on
The Division with Rebecca Gayheart who was in
The Christmas Blessing with Neil.
Michael Gross (Ted's father) played Neil's stepfather in
Snowbound.
Longer one: Jason was in
Can't Hardly Wait! with Lauren Ambrose who was in
Diggers with Ken Marino who was on
Veronica Mars (and
Angel) with Aly and on
Dawson's Creek with Busy Phillips.