There is a connection to the odd name of the film which isn't apparent until the conclusion of the murder investigation. Although this is a crime thriller about an adulterous man's murder of his wife, the term 'Rogue's Yarn' is a nautical one, describing the yarn used only in naval rope and indicated from their colour the ropeyard in which they were made. They were introduced to stop thieving by making the rope easily recognizable. In the days of sailing, naval rope was considered far superior to any other, and there was a great temptation to smuggle it out of the dockyards and sell it to owners or captains of merchant vessels.
The connection becomes obvious near the end of the film.
Only one other oddity. John Marsden intended to murder Inspector Walker by filling up the below deck cabin with butane gas so that it would explode when he struck a match to light his pipe. It would become instantly obvious to anyone entering the cabin that the smell alone would be sufficient warning that something was amiss. Anyone who has used butane in caravans would recognise the smell, so why didn't the Inspector?
The connection becomes obvious near the end of the film.
Only one other oddity. John Marsden intended to murder Inspector Walker by filling up the below deck cabin with butane gas so that it would explode when he struck a match to light his pipe. It would become instantly obvious to anyone entering the cabin that the smell alone would be sufficient warning that something was amiss. Anyone who has used butane in caravans would recognise the smell, so why didn't the Inspector?