Of the 26 episodes produced, 23 survive.

"Redcap" was the kind of series where there was no guarantee that the criminals would be apprehended.

The distinctive military theme tune was sourced from the KPM Music Library as so many TV and film themes were up until the 1970s. You can often here this piece of music in other TV and films productions worldwide, most notably as incidental music in the second season of the 1967 Spider-Man (1967) cartoon series.

"Redcap" was the first major television success for John Thaw.

Even though John Thaw was only 22 when he was cast as Sergeant Mann, his advanced maturity gave him a considerable advantage for such a role.