Hi,
Here's what I know. But remember that's it's all "heard of" so there maybe some errors!!
For Jon, I don't really know why he used the Golf. Maybe the Impreza wasn't ready.. Maybe Julien could answer that if he sees this!! From what I heard, Jon will be in Maine with the Impreza...
For the DNFs:
Erickson: rolled
Julien: alternator
Paynter: rolled
L'estage (Buffum's elantra): Mechanical
Nichols: transmission (not sure about that)
Don't know about the other ones!