Nope, it's a best of seven series. Now, the Lakers, as a team which finished with better stats gets a home court advantage. That advantage comes into place during game 6 and 7, which are in many cases crucial. First two games were in LA, and between 1, 2 and 6, 7 there are 3, 4, 5
This way LA gets 4 games and Detroit gets 3.