Continuity mistake: At his first practice in Looney Land Michael has a sweat stain on his chest which disappears and reappears between shots.
Continuity mistake: Bugs and the duck had the black/white tennis shoes for Michael, but in the last game Mike wears black ones.
Other mistake: The Phoenix Suns/New York Knicks game (with the Knicks as the home team) is being played at the Los Angeles Sports Arena.
Continuity mistake: When Michael is warming up in the Looney Tunes gym and takes a jump shot, the ball enters the basket as if he was shooting from the left side of the basket. He actually shot from the center of the court, so the ball should have gone in differently.
Other mistake: In the movie the planet that the aliens live on is called Moron Mountain but on the scene selection screen, it says Moon Mountain.
Answer: These were all actual characters from Looney Tunes.