After the alien steals Patrick Ewing's talent the referee throws the ball to him for a free throw. The ball hits Ewing in the chest. When Michael is watching TV and sees the replay of the incident, the ball hits Ewing in the forehead.
In the scene where 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 foot.
During the scene in Madison Square Garden, The court goes from having only the professional three point line and an orange lane, later on in the scene, there are two three point lines, college and professional, and the lane is now blue.
When Michael first arrives home after the baseball game, the name of the dog "Charles" is on the dog house. When Daffy goes to Michael's house to get his shoes and shorts and the dog attacks him, the name is missing.
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.