When Stanley comes into Michael's hotel room and says "C'mon, Michael, it's game time. Slip on your Hanes, lace up your Nikes, take your Wheaties and your Gatorade, and we'll grab a Big Mac on the way to the ballpark." All of those things were products that Michael Jordan had been a sponsor for around that time.
After Daffy suggests naming the team "the Ducks", Bugs asks "what kind of Mickey Mouse organization would name their team the Ducks?" This actually happened in 1993, when the Anaheim Ducks of the National Hockey League were established by The Walt Disney Company.
Noel Blanc (Mel Blanc's son) was originally booked to provide all of the regular Warner Brothers male cartoon characters' voices. But he and Warner Brothers couldn't agree on a contract, so the studio replaced Blanc with four other people to do the 12 male voices, instead of Blanc doing them all.
The Monstars/Nerdlucks' names are Pound (orange one), Bang (green), Nawt (magenta), Bupkus (purple) and Blanko (blue). None of their names are mentioned in the film, and neither is the word "Nerdluck."
While praying in church for the return of his basketball skills, Charles Barkley says, "I'm never gonna go out with Madonna again." This refers to his own fling with Madonna (not Dennis Rodman's fling, as previously reported).
The scuffed basketball used in the film is a treasured souvenir owned by director Joe Pytka. When held by Michael Jordan it is real, but whenever it is in flight or controlled by the cartoon characters it is animated.
When Daffy Duck is modeling potential team uniforms for the other Looney Tunes characters, he states that he's partial to purple and gold. This is a nod to the official colors of Omega Psi Phi Fraternity, Inc. which is the fraternity that Michael Jordan pledged in college. A tradition for some members of Omega Psi Phi is the branding of one or more of the Greek letter Omega on their arms or chest. If you look closely during the scene where Michael Jordan is shirtless in his hotel room while on the phone with his family, on the left side of his chest is a branded Omega.
In order to fill up the audience from a limited selection of characters, one section was made from actual Looney Tunes. The rest were simply replicated over and over and then "seated" next to each other to create the illusion of a full audience.
Moron Mountain is a spoof on Magic Mountain, a Six Flags amusement park in southern California. At around the time this movie was made, Magic Mountain had a contract with Warner Brothers to use the Toon characters.
When Michael first arrives in Looney Tune town and is talking with the characters there is a store front sign on one of the background buildings that says "CJ's Toys", a nod to the famous Warner Brothers Director/Animator Chuck Jones who created many of the classic Looney Tunes characters.
In an interview a couple of years after the films release, long time Looney Toons Director Chuck Jones was highly critical of the movie. Jones felt it strayed too far from source material, in particular saying Bugs would never openly recruit others in his battles. Jones further maintained that the Bugs he worked on would have single handedly dispatched with the Aliens in short order. Jones also took exception with some of the film's dialogue feeling that some one liners were inconsistent or inappropriate relating to the characters who said them.
During the big game, when the Toons are rallying, the purple Monstar is about to attack Bugs and Wiley when he is interrupted by Yosemite Sam and Elmer Fudd (dressed in tuxedos) shooting his teeth out with "Misrlou" playing in the background. This is a clear reference to Pulp Fiction (1995).
Towards the end of the basketball game, Daffy asks Bill Murray, "exactly how did you get here?" Which Bill's character responds, "the producer is a friend of mine". Producer, Ivan Reitman, also produced: Stripes, Ghostbusters & Ghostbusters II, all of which Bill Murray starred in.
CASTLE THUNDER: First heard during a "film-within-a-film" for one second when Michael's kids are flipping through the TV channels and lightning appears on the screen. It's then briefly heard again for one second when the little aliens begin to transform.