The early episodes' disconnect from the original series is clearly intentional, in my opinion. David is teasing us; we've waited 26 years, he's going to make us wait as much as Dale has, and will, to return to Twin Peaks. Think about it... Angelo's music is largely missing. We haven't even seen doughnuts or pies on the show yet! Hawk brings a box of doughnuts and he doesn't open it. These may seem like trifle observations, but it does make you feel like David and Mark are toying with us. Getting to Twin Peaks is part of the mystery of teh new episodes to be honest. We are getting there slowly; the town has a bigger presence every episode, and I think once the different plots converge and we are back in the town full-time, the show will have transformed into something.
Think of the early episodes as the first section of Fire Walk With Me which was set in a completely different location with a different cast, but ultimately led to (and tied into) everything that was happening at Twin Peaks. He did it say it's an 18-hour long... and he does have a tendency to have extended "openings" to his films, such as the previously mentioned FWWM and Lost Highway.