Targeted defense, that's the biggest difference between the regular season and the playoffs.
Some star players might perform brilliantly during the regular season, but come playoffs, their true nature is revealed.
The reason is they can't handle the targeted defense set by the opposing team.
The regular season is like a whirlwind tour, with many games and short intervals between them; you don't have much time for detailed analysis of your opponents.
But playoffs are a completely different matter, akin to the difference between a girl from KTV and a formal girlfriend. For a girlfriend you'll be with for a long time, you have to study her tastes, temper, and favorite topics to cater to her.
And because it's a life-or-death series, some extreme tactics that are impossible in the regular season might appear in the playoffs.