Despite the fact that half of the movie's cast is animated, producer Ivan Reitman wanted the basketball scenes to be as close to the real thing as possible. That meant that he wanted the Monstar aliens to act especially like the players whose powers they possessed.
In a bigger change, the viewer now learns that Patrick Ewing, Mugsy Bogues, Larry Johnson, and Shawn Bradley were not the original choices for the players whose powers are lost.
In an effort to bring out the squeakiest clean players, those four were chosen, which Reitman, on his DVD commentary, says should be obvious. “If you were going to steal any player's powers, why would you choose Bogues or Bradley,” he asks.
The additional footage reveals not only the players originally envisioned for the film, but ways in which that particular player’s actions would affect the climactic game.
Instead of Michael Jordan leading his team to a comeback victory, the original Monstars merely brought themselves down.
That would include a big change to the climactic game between the Monstars and the Toon Squad was that the alien who took Charles Barkley's powers never made it to the game because he was pulled over for drunk driving on his way to the arena.
When pulled over, he attempted to spit at the officer, but unfortunately hit Granny. That's why she is barely seen towards the end of the movie.
When it came to selecting the players after Barkley, naturally, the first one chosen was Shaquille O’Neal, then the second biggest star next to Jordan.
Originally, it was scripted that with the Monstars trailing by one, the alien who took O’Neal’s powers would be fouled and get a chance to win the game by sinking two free throws.
The shot attempts were way off and the Monstars lost. The alien would then choose to stay in cartoon land and pursue a rap career.
Another player whose powers were stolen was Pacers guard Reggie Miller. During the face off against the Toon Squad, the alien begins squabbling with a particularly loud fan in attendance. He would then run into the crowd and being fighting with fans, earning an ejection.
Then New Jersey Nets player Jayson Williams was also tapped for a role. Once he got to the arena, he would see Wayne Knight’s character, that of Jordan’s assistant and driver, and shoot him down.
Even other retired players were considered to be featured, such as Isiah Thomas. For him, once the alien stole his powers, he would be suspended from the game for sexually harassing Lola Bunny.
The heads of Moron Mountain would have to sell all their assets to pay her off in a following lawsuit that would have been featured in the sequel.
Every team needs a sixth man, and for that role, Reitman wrote in Latrell Sprewell to have his powers stolen by an additional alien. That alien would be ejected from the game and storyline when he strangled Bill Murray.
That is the reason why Murray only shows up towards the end of the game. He would need time to heal from the assault.
Although the film was a financial success, Reitman ponders what might have been. He had planned a sequel/spinoff in which after Moron Mountain is bankrupted by Lola Bunny’s sexual harassment suit, they are forced to play an intergalactic baseball game.
The aliens would attempt to get powers from such major leaguers as Roger Clemens, Barry Bonds, Mark McGwire, and Sammy Sosa.
The film never happened however, because the players said they would never participate in any project where someone takes the shortcut to victory.