Eve and Ed are driving to buy Chief a birthday present when Eve starts talking about Ed's zodiac sign. The strange coincidence is this episode aired only one month prior to when the actual Zodiac killer murdered his first victim in the SF area (Dec 1968). Ironside was also based in SF.
This episode aired 6 days before Barbara Anderson (officer Whitfield) 23rd birthday
The director and two of the actors all have same first name. Don Mitchell, Don Gallow, Don McDougall