Yep, was thinking that whilst watching, although i didn't notice our Cochem hairpin? I thought some of the footage was on the backroad from Hohe Acht forest car park down to Adenau (comes out next to Lidl).
Enjoying the new series so far, although they need to be careful... the DB11/Merc S63 AMG feature was superb, right up until the point where they felt they needed to act out a police chase. Too silly and fake from that point onwards. Oh, and the fact that the Ring footage was chopped up into silly sequences, but I guess your average viewer won't know that. There was a bit where Sabine was chasing a 911 GT3 and she overtook it through the long last corner. But the previous shot was of her catching the same car in Aremberg, only a couple of mins into the lap.
Still a good watch though.