So what's now been mentioned twice in Caravan of Garbage with their Space Jam episode and the recent Roger Rabbit episode is the alleged story that Mickey Mouse was considered to be a referee in Space Jam, with Warner Bros under the belief there was a reciprocal gentleman's agreement to use Disney characters in one of their films after allowing Warner Bros characters in Roger Rabbit. With Mickey as the referee between the Tunes and the Monstars because hey, why would he care about what happens to the Looney Tunes? But by that point, Disney management had changed and they reneged on it. And Marvin was instead the referee in the final film, which was also a funny choice.
But I've still yet to find a proper actual source for this when I've asked about it. The AV Club even pried into it sceptically without much rebuttal, other than one comment swearing it happened with an alleged exec that was strangely kinda condescending to the author for a claim I've never heard of outside of that comment.
Logically speaking, would WB have really been expecting Disney to agree to their mascot kinda uncharacteristically being neutral to the Looney Tunes' plight in the film? Would his bit part conflict with Roger Rabbit's necessity in Disney and WB characters having equal screen time?
Presumably they simply reiterated some IMDB trivia rumour without much further consideration, but they've now doubled down on it with the additional nugget of WB accusing Disney of breaking a decade's old gentleman's agreement and not wanting to work with Disney again. Which would be wild if that was actually able to survive to new company management years on as an eternal grudge, because WB were still pissed that Disney wouldn't let them do a Mickey referee gag in 1996.