This is the first Adult Animation Netflix Original Film.
The book that Martha Washington reads in bed is "What to Expect When You Are Defecting".
The recurring joke of George Washington misattributing quotes to the bible is loosely based on true events. Washington was known for using familiar biblical idioms in his regular vocabulary. His most used passage being a Hebrew blessing, that every man shall sit safely "under his vine and under his fig tree."
The sledgehammer that the Blacksmith uses has the words "Property of John Henry" engraved on the side. John Henry is an American folk hero, known for winning a rock chiseling race against a steam-powered rock drilling machine. After his victory he died from exhaustion with the hammer in his hand. The Blacksmith is loosely based on him.
The song in the end credits is the National Anthem of Russia.