Ah, interesting tidbit on the Hill/Detroit guys.
When you look at the two Blaylock scans (card 2) there does appear to be a distinct silver foil to the name on one and a darker foil on the other.
However, when comparing the Dino Raja (11), there is a colour difference but the two scans have differing brightness/contrast in general. It is hard to tell if the card scanned as a silver parallel actually has a more silver foil or if it is just because the scan is "lighter" in general.
I only have about 70 cards in the set and I think a bunch are series two. Will pull out what I have when I get home and see if I can see any foil variations in the series one cards.