New Prime 5 opens with Ferris and Dutch in a bar. The bartender's name is Carl. There's a neon sign on the wall that reads "Where the Earth is soft". Guess Daniels was lying to Scar, he really is real.
The sound effect used for when Bob teleports is also used when The Phantom teleports.
Dutch's mark is never outright explained. Hans was his brother. Ferris got his when Brenda died. Dutch must have gotten his when Hans died.