The opening titles used for the first 14 episodes included a clever shot taken of the then President of the United States of America, Lyndon Baines Johnson, on his visit to Australia. The shot pans from the President to a watchful John Hunter in the crowd.
At one point, Australian oil company Ampol, who sponsored the series in the first year, planned a national advertising campaign which, if it had gone ahead, would have seen the faces of Tony Ward and Fernande Glynn appear on every Ampol petrol pump in Australia.
The car driven by John Hunter is a Ford Mustang that was imported especially for the series, as the model was uncommon in Australia at the time. The vehicle's registration number is JOH 999, which is a genuine Victorian registration. The letters in this registration are for John Hunter and the number was chosen to signify the Nine Network.