We've seen this occur before with the Lakers. Just like in LA's previous playoff series, the Lakers were ambushed in Game 1. LA lost to Portland and now was blown out by the Rockets in the series opener.
The Lakers responded by destroying the Trail Blazers by 23 points in Game 2 while winning the next four games in that series. Part of that Game 2 victory was because the Trail Blazers were tired and in a letdown spot. That could happen to the Rockets, too, since they were coming off a grueling 7-game series against the physical Thunder. 
LA hadn't played in six days before Game 1. The rust should be off now for the Lakers, especially their reserve and role players who were outplayed. It shouldn't have happened, but the Lakers also were caught off guard by the Rockets' speed. They won't be anymore. LeBron James won't let it happen again.