Derrek Van Eaton provides lead vocal, bass, flute, guitar and drums.
Lon Van Eaton supplies vocals, piano, guitar, sax and drums.
Other musicians appearing on the album :
Jim Gordon (drums), Andy Newmark (drums), Paul Glanz (organ), T.J.Tindall (guitar), Mike Hugg (harmonium), Alexis Guevara (conga), Richard Davis (bass).

The sleeve design was by Klaus Voorman, with photographs by Clive Arrowsmith.

The album also comes with a unique "free gift".
A piece of perforated card that can be split into three pieces each measuring 11 1/2" x 6", one of which I show above. These can then be joined together in a cylindrical manner with the pictures on the inside, and then placed on a turntable and spun at 33 1/3. Then looking through the slots one sees a fine example of early moving pictures which looks something like :

There is a good interview with the boys here at Abbeyrd's Beatles Page