It was the best of Time, it was the worst of Time: A tale of two bands

[Neb-Maat-Re]

As we all well know, Fleetwood Mac has been many different bands during it's life - but I don't think it had ever been two different bands on the one album before. Still, it seems to hang together reasonably well - I don't find the differences as noticable as, say, some of Lindsey's tracks on Tango.

As I understand it there's one line-up of Mick, John, Billy Dave and Bekka with Steve Thoma on keyboards on some tracks and the other line-up of Mick, John, Christine with Michael Thompson on guitar.

But being overly pedantic, I notice that on I Wonder Why and Winds of Change, Thoma is listed as "Additional Keyboards" - additional to who? Did Christine contribute to these tracks?

Similarly, on I Do, Thompson is listed as "Additional Guitars" - additional to Billy, perhaps?

Or are these simply typographical terrors?