They could have very easily lost 4 of 5 to the DBacks. Already behind to the Cardinals. Defense has been terrible lately. Way too bad ABs. Offense seems to be tanking, and pitching isn't as good the last couple of weeks.
In my opinion wrapping up the division so early makes it very difficult for a team to maintain its focus and competitive edge. And once you've lost that, it's really tough to flip the switch and get it back once the playoffs start.
Frankly, it wouldn't surprise me to see the Dodgers bow out of the playoffs in the 1st round.