Mickey's rival in this show is Mortimer Mouse, taken from the animated short O Rival do Mickey (1936). When Walt Disney first created Mickey, he intended for the name to be Mortimer, but his wife convinced him to change it to Mickey.
This is one of the few Disney Television Animation shows that cannot be streamed on Disney+. Despite this, many of the episodes have been uploaded on YouTube by fans without copyright issues.
Dinossauro (2000) is the only Disney Animated Feature Film, that came before O Point do Mickey (2001), not to feature any characters in the club, due to that film being in CGI, instead of hand-drawn.
Even though Jim Cummings voices various characters in the series, Winnie the Pooh and Tigger do not have any lines in the series whatsoever.
Max Goof is the only Disney Channel character to appear in the series. While he was actually first introduced in a short "Fathers Are People" in 1951 he was originally depicted as Goofy Junior with a different design, his character depicted as Max Goof was introduced in the Disney Channel series Goof Troop (1992) along with its theatrical movie A Goofy Movie (1995) where he's a teenager.