A third imaginary leg existed between Amsterdam and Felixstowe to justify the programme's title, but this was not operated by the ferry company.

The scripts involved clichéd relationships and stilted dialogue, making the show the butt of several jokes—particularly on Terry Wogan's morning Radio 2 programme—which caused some embarrassment to the BBC.

In 1992, the BBC screened TV Hell, an evening of programming devoted to the worst that television had to offer, and the first episode of Triangle was broadcast as part of the line-up.

Advances in portable video cameras and recording equipment meant that the show could be videotaped on board a real ferry with more realism than using studio sets and more cheaply than using the 16mm film that was normal for location television drama at the time.

The cameras were perfectly comfortable with either natural or artificial lighting conditions, but a mixture of the two always produced unnatural-looking colour.