Regarding Wulff Castle, the teams had that clue at LAX, so very unlikely it was the pit stop, but rather the first clue location.
Also, comparing times, Dan is on the wire at 9:44 and reading the clue at 9:46, so the Route Marker clues they are shown reading are after the Road Block.
So JeJo finish the RB before Dan/Jordan then Steve/Allie(who you can see on the wire behind Dan).