Pluto is referred to as "James" by Mickey, while serving him, in the 1941 Mickey Mouse Cartoon "A Gentleman's Gentleman", instead of "Pluto". This is because "James" is a typical name for usually English butlers in fiction, since it originated in English fiction. Examples of this in films are Charles Chaplin's 1931 film "City Lights (1931)", where the little Tramp at one point calls the Millionaire's butler "James", before he himself drives off. A very popular example for this is the 1963 Swiss comedy TV sketch "Dinner for One (1963)", where Miss Sophie's (played by May Warden) butler (played by Freddie Frinton) is English and is named "James". It is usually a Gentle, well mannered butler in the way of a Gentleman, and that is why Mickey calls Pluto "James" in "A Gentleman's Gentleman" from 1941.
Near the end of "A Gentleman's Gentleman" from 1941, Pluto, just like he read in the "Pluto" comic strip, lands in a mud pit, while instead of a butterfly resembling a bow, like in the comic strip, has a paper resembling a bow on his head, while having a Blackface made of the mud he is in, unlike in the "Pluto" comic strip where he is completely full of mud. Notable is that this is the second and final time Pluto has a Blackface in a Mickey Mouse Cartoon, where he is voiced by Lee Millar. The first one was the 1940 Mickey Mouse Cartoon "Pluto's Dream House (1940)", where he got a red and green colored Blackface.
"A Gentleman's Gentleman" from 1941 inspired the creation of the "Pluto Gets The Paper" "mini-shorts" of the "Mickey Mouse Works (1999)" TV series in the late 1990's, starting with the fourth episode "Pluto Gets The Paper: Spaceship/Donald's Rocket Ruckus/Goofy's Extreme Sports: Paracycling/Organ Donors/Mickey's Mistak (1999)", which aired on May 22nd, 1999, and in the sixth episode of the third season in the TV series "House of Mouse (2001)" "House Ghosts (2003)", which aired on October 10th, 2002. These "Pluto Gets the Paper" "mini-shorts" all have Pluto tasked to fetch the newspaper by Mickey, and having to go through various obstacles in the process. Despite these interferences, Pluto completes the task well at the end. Like the Pluto Cartoons, these shorts entirely rely on physical humor.
The Animation of Pluto shaking the gumball machine in "A Gentleman's Gentleman" from 1941 was later re-purposed in the 1949 Pluto Cartoon "Bubble Bee (1949)", where the gumballs also become a major focus.
The Poster for "A Gentleman's Gentleman" from 1941 has Mickey wearing blue nightwear instead of the red/orange ish clothes he wears in the Cartoon. Pluto's collar on the Poster is also in a red type of color, instead of the green one he wears in the Cartoon. Mickey also has eyebrows in the Poster, a feature to his character design that Mickey first got in his third to last Cartoon (if you don't count his cameo appearance in the 1952 Goofy Cartoon "How to Be a Detective (1952)", where Mickey's face appears on the cover of the comic book Goofy is reading) "Pluto's Party (1952)" from 1952.