I think it was hard for them to adjust to the Yao-less Rockets. This new Rocket team doesn't play like it did with Yao in the middle. Instead they run the floor and try and steal the ball. By doing so, they put pressure on the Lakers to respond and they don't seem to have enough ball handlers besides Kobe.
LA's offense seems very out of synch, Gasol was the only one scoring consistently. Odom and Bynum have dissapeared in this series. Everyone knows that if you can make Kobe work for his shots that the others have to step up and get open. With Artest leading the way, the Rockets are always focused on slowing Kobe down, and the other Lakers aren't doing enough to help them win. I think the real problem is that the running Rockets are harder for the Lakers to defend. They can't stay in front of them or keep them from driving the lane.
It's possible Phil will find a way to make some adjustments, so there's no need to panic yet. It's just that this series has presented the Lakers with some different challenges and they're having to stretch a little to win. They may not be good enough, they look a little thin on talent even with their starting five, and their bench is weaker than the Rockets.