Bilingual Bonus: Certain shorts set in other countries have the characters speak the language of said country (i.e., French in "Croissant de Triomphe", Japanese in "Tokyo Go", Italian in "O Sole Minnie", Portuguese in "O Futebol Classico").
Characterization Marches On: Instead of his original mischievous rascal persona or his everyman persona, these shorts instead tend to take Mickey's heroism and determination and play them for laughs.
Darker and Edgier: The series tries to show off some of Mickey's old pluck and rascality.
Furry Confusion: After all the years of confusion, the fact that Pluto and Goofy are both dogs is addressed for once in "Dog Show", where Mickey has Goofy switch places with Pluto after Pluto gets injured jumping off a cliff trying to catch a stick (caused by Goofy no less).
Out-of-Character Moment: In "No Service", Goofy deviates from his usual bumbling self and becomes quite a jerk as he runs a seaside snack shack, strictly following its "no shirt, no shoes, no service" policy. As part of all that, he unceremoniously turns Mickey and Donald away because the former does not wear a shirt and the latter does not wear shoes.
Well, he's tryin' to run a classy establishment!
Goofy seems to slightly be going back to his "George Geef" days in these, a period in the 1950s when Goofy would appear in a number of bit parts as various characters.
Pie-Eyed: Everyone has these eyes, making it a throwback to the classic shorts.
In "Croissant de Triomphe", as Mickey tries to fight traffic in Paris, he races through Cinderella's castle (looking exactly the castle from Walt Disney World) and goes between Cinderella and Prince Charming as the prince is about to put the glass slipper on Cinderella's foot. As the mouse races by, the prince drops the glass slipper and it shatters.
"Tokyo Go" has several: 1) Mickey's job as a live steam train conductor, which is a reference to Walt Disney's Carolwood Pacific Railroad; 2) The train in question resembling Casey Jr. (whose theme song is heard playing in the background); and 3) The bullet trains' horn sounds sounding the horn sounds of the Disneyland Monorail.
"Potatoland" looks exactly like Disneyland made out of potatoes, gravy, and lumber.
In "O Sole Minnie", Willie the Whale from the Make Mine Music segment "The Whale Who Wanted to Sing at the Met" interrupts Mickey's serenade. At another point, Mickey bumps onto the Disneyland "it's a small world" clock tower.
"Down The Hatch" has several to the old Disneyland attraction "Adventure Thru Inner Space", culminating in Donald singing the song "Miracles From Molecules" in the credits.
Spotlight-Stealing Squad: Goofy has made the most appearances, in a total of 13 shorts, followed closely by Minnie, who appeared in eleven shorts. By contrast, Donald appeared in only seven shorts, Daisy in three, and Pluto and Pete in one each.