While many people feel JJ Redick did well in his first season as an NBA head coach, he did likely make one real blunder while at the helm of a Los Angeles Lakers team that many felt had a real shot at winning it all.
In Game 4 of the first round of the playoffs versus the Minnesota Timberwolves, he played just five men in the second half. The Lakers played well in the third quarter and outscored Minnesota 36-23, but they fell apart in the fourth quarter. In that final period, they mustered just 19 points and had some miscues toward the end as they fell, 116-113.