Brian Trenchard-Smith was hired after the producers had been impressed by his handling of action in "Turkey Shoot". He says the script was originally set in Melbourne but he persuaded them to re-set it in Sydney to take advantage of that city's locations. He set it on the northern beaches and wrote action sequences based on "my concept for the BMX action being putting BMX bikes where BMX bikes aren’t meant to be." The movie was shot over 41 days, a longer than normal shoot because of the labour restrictions caused by the fact many of the cast were under 16. Trenchard-Smith: