The mayor took matters into his own hands after the NBA revealed that LeBron James should have been called for goaltending late in Game 5.
Bickerstaff will replace David Fizdale, who was fired on Nov. 27 after a 7-12 start to the 2017-18 season.
The NBA confirmed referees missed two crucial calls late in the Cleveland Cavaliers' win over the Indiana Pacers.
Out since March 23 because of a knee injury, Stephen Curry appears close to a return for the Golden State Warriors.
The Grizzlies are working on a contract with J.B. Bickerstaff to make him the team's head coach.
John Wall said he and the Wizards "are very confident" they will win Game 6 in Washington and force a Game 7.
The only way for Mitchell's comments to be true would be if the Jazz can finish off the series in Game 6 as it shifts back to Utah.
Trailing by 25 points in the final quarter, Oklahoma City outscored Utah by 23 points in the second half to win 107-99 in game five.
Budenholzer was one of at least a half-dozen candidates the Knicks have talked to about their head-coaching vacancy.
George Hill is still dealing with the back spasms that caused him to miss game four as the Cleveland Cavaliers levelled the series at 2-2.