The well-known, successful jazz singer, Bill Henderson, plays the part of the driver of the Cadillac involved in the traffic accident with Raj.
On September 6, 1977, the day prior to this episode being taped, Danielle Spencer was injured in a head-on collision on Pacific Coast Highway in Malibu, California (which took the life of her stepfather, and left her in a coma for three weeks). This is why Spencer does not appear in this episode.