I don't know if this was already said; it's not really a spoiler but indeed is an interesting tidbit:
Jenna M (winner of Amazon) was asked to do this season but said no so she could be with Ethan; this in turn opened up a spot for Sandra. So had Jenna said yes to this season, Sandra would not have been on.
And I'll put my next comment in white because some people don't like to know about winners/boot order:
Click to see Spoiler:Funny that Sandra is the alternate and ends up winning the season How fitting that the supposed female "alternate" wins the All Star season...again