On Paxson's game winner they were guarding Jordan extremely tight which opened it up for a wide open Paxson. He made the shot, but should have made the shot. If he misses that shot the Bulls still play game 7 and probably still win the title (1 of 6 won by Jordan).
On Allen's shot, it was a great rebound from a Lebron James' miss by a Miami teammate and Allen hit an incredible shot fading away over a defender's outstretched arms. If Allen doesn't hit that incredible shot the Spurs win the NBA title (1 of 2 won by James).