My guess it that the smudge on the back is because of the photos being stacked. I think the Andrea probably went through a stack of photos and signed them all, and someone else (secretary, etc) went through to get the names of the people and then wrote them it. It is also possible Andrea herself did it.

I just recieved my autograph from Andrea Bowen and was convinced from it's appearance that it's a PP, but when I got on here to look at other successes it looks quite different.

The thing is, the inscription is in a thin marker where the strokes are obvious, but the signature is in a thick marker and the ink didn't go down inside the grains of the photo, so it's really rough and bumpy looking. It has a smudge of ink on the back of the photo that doesn't match up with the signature, could the strange appearance be from stacking the photos before the ink dried or is it fake?