The PROMOS for SOS, Bang-A-Boomerang, I Do, I Do, I Do, I Do, I Do and Mamma Mia were directed by Lasse Hallström at a combined cost of less than 50,000 Swedish Kronor. These were the four songs that were felt to have the strongest hit potential from the ABBA album and filmed with a view to promote it.

One studio shot with them all looking up was filmed at the same time as the PROMOs to Mamma Mia and I Do, I Do, I Do, I Do, I Do which were both mainly filmed in a studio. That shot was part of the original PROMO to SOS but it was re-shot as this version as it was felt it was too similar to Mamma Mia.

It's available on ABBA Gold (video and DVD) and the DVD ABBA - The Definitive Collection amongst others.

Frida's pink jacket is on display at the ABBA Museum in Stockholm.

Throughout August 2021, several ABBA PROMO videos, including this one, were upgraded on YouTube to 4K, with a noticeable improvement in quality.  On 2 September 2021, it became clear that the upgrade to these videos was due to their inclusion in the PROMO for I Still Have Faith In You which included clips of several of ABBA's biggest-selling songs.

On 17 June 2022, a new "lyric" video of SOS was released.

The weirdest shot ever of Agnetha - it looks like a kneecap with a blonde wig over it and has a smiley face on it if you look hard enough!

Lyrics available on the Official ABBA site

ABBA The Museum; 

Thanks to Ian Cole and some info from Bright Lights, Dark Shadows by Carl Magnus Palm. Thanks also to Philip Muytjens and Alex Jones c/o ABBAtalk.
Some information from ABBA Report Issue 11
YouTube links c/o ABBA