Frida appears on the right in a "blink-and-you'll-miss-her" appearance singing backing vocals with Lena Ericsson on Harpo's song "Movie Star". This was part of the programme featuring a report on how a record was made. This was probably the first time Anders Hanser photographed an ABBA member.
Anders Hanser's photograph of Frida is included in his book "From ABBA To Mamma Mia!". He had invited ABBA to take part in the first show but they won Eurovision and he couldn't get near them until a few years later when he also met his future wife, Görel.
Extra thanks to Jan Bach c/o ABBAMAIL