Churchill's name on his title card is tinted yellow.
This is the second battle where both rappers are shown in black-and-white at one point, after Mr. T vs Mr. Rogers.
Churchill's hand gesture in his title card is his famous V sign, which he used to refer to the V for Victory campaign.
The way Theodore Roosevelt's mouth moves as he says, "What's up, bitches?!", and the phrase itself is a reference to Roosevelt's appearance and catchphrase in the ERB News videos.
The line, "I'm the Rhyme Minister, fresh in a hat and dinner jacket," features the phrase "Rhyme Minister", which also appears in Dan Bull's Twitter account biography.
Roosevelt is the fourth and final President whose face appears on Mount Rushmore to be in a battle. This is acknowledged by Churchill in his second verse and by the cameo appearances of fellow Mount Rushmore Presidents George Washington, Thomas Jefferson, and Abe Lincoln, who had all rapped previously.
In the line, "Your whole miserable country is the size of one state!", an outline of the entire island of Great Britain morphs into an outline of the American state Alabama. In reality, Great Britain is over 80,000 square miles, and only the country of England, at around 50,000 square miles, is close to the size of Alabama, at around 52,000 square miles.
As the line does not specifically refer to Alabama, this could instead simply be artistic license, and not a factual error.
In the line, "Steady there! I don't think it's very fair," the word "it's" is misspelled as "its".
Dan Bull's hair can be seen under Churchill's hat frequently throughout the battle, even though Churchill was bald.
Theodore Roosevelt vs Winston Churchill. ERB Behind the Scenes