When Daffy Duck is strutting down the runway showing off his many different looks, his basketball sneakers are shaped like regular sneakers at the toe. In the next shot, they are shaped like his webbed feet.
When Bill was first shown on the court for the Tune Squad, he didn't have a hat on. Then in the next shot of him he has a hat on backwards.
When the talent is stolen from Patrick Ewing, the first clock shows 6:07 left. When the camera pans the other way and when he heads to the free throw line, the clock shows 6:13 left. A few shots later, it's 6:16, and when he finally throws the ball, it's 6:12.
The arena and the arena floor change during the Knicks-Suns game at the beginning.
The score is 68-66 for the Monstars. When Stan is inflated out of his pancake state and flies past the scoreboard, the Tune score is shown as 77-67, when it should be 68-69 as Stan has accidentally scored three points. Seconds later, the final score is shown as 77-76.
Many of the Monstars jump and slam from beyond the three point line, but every one is only counted as two points.
At the end of the movie when MJ returns to the Bulls, his first game back is depicted against the Orlando Magic, when in reality, his first game back was actually against the Indiana Pacers.
Porky Pig interrupts a Wile E. Coyote/Road Runner cartoon to announce an emergency "cartoon character union meeting". Later, when Daffy is complaining about his job while retrieving Michael Jordan's gear, he says, "If this were a union job..." However, the "union meeting" is just the excuse Porky gives for the cartoons to gather and talk about the aliens. It doesn't need to match up with Daffy's comments.
When Michael is sucked through the golf hole by the Looney Tunes, only his left shoe flies off his foot and lands on the green, not both of them. When Michael emerges in the cartoon world, you can clearly see that he has only one shoe on his right foot and only a sock on his left.
Daffy is a duck, and ducks don't dig tunnels. When he and Bugs are getting Jordan's UNC shorts, Bugs leads Daffy to the house in a tunnel, but when they disagree about which way to go in, Daffy tunnels to the back door by himself.
When Charles the Dog jumps on Michael Jordan to lick him when he comes home from his baseball game, the dog is clearly a stuffed animal.
When Michael's children shoo Barkley the bulldog, the shot of the dog leaving is a mismatched composite shot. The dog is shot from a high camera angle, but the background plate is at a low angle.
Larry Johnson only grazes the hospital doorway, but is still knocked out like Shawn Bradley and Patrick Ewing.
At the end of the credits, it's written "Al material is protected by...".
When Michael is landing in the space ship at the baseball field, the crowd of live people are looking up, but none of them are looking up in the sky in the same direction.
When the spaceship lands and the door opens , you see one of the cartoon characters get squashed by the door , but in the shot , the character is gone .
When Stan is looking down the hole on the green, asking for Mike to come back out, the hole is the same diameter and circumference of his head.
When Stan Podolak falls in the Birmingham Barons' dugout, we can clearly see the mat that he falls on.
When Michael's kids are watching cartoons in their living room, the camera and cameraman are seen in the TV reflection, with none of the actors present.
When Bugs and Daffy go get Michael's gear, Daffy finds himself in the doghouse with the dog. Minutes later they find the shorts, which are oddly in a closet, not displayed proudly like the sneakers, and the dog is suddenly in that second floor closet, despite all the doors inside the house being shut.
Michael is talking to Shawn Bradley when he says "You want your talent back?", but calls him "Pat" instead of "Shawn."