The song is unusual for Ultravox in that it is mainly guitar rather than synth driven.
The 'performance' part of the promotional video was shot in very cold conditions over the weekend of Saturday, 14th - Sunday, 15 January 1984, primarily at the Callanish III standing stones site at Callanish on the Isle of Lewis in the Outer Hebrides (Western Isles) of Scotland. Other non-performance parts were filmed at the main Callanish I standing stones site and edited into the video and featured individual band members reflected in vertically placed triangular-shaped mirrors.
Limited editions of the 12" single include the "Special Remix Extra" of One Small Day in place of the "Special Re-Mix", which is 8:31 long.
There was a third remix entitled "The Final Mix" which was issued as part of a limited edition bonus disc with "The Collection" entitled "The 12" Collection". the "Final Mix" of "One Small Day" runs for 7:36. A version of the "Final Mix" was included on the definitive reissue of "Lament". This version has a longer fade out and runs to 7:44.