Can't Un-Hear It: Even though Will Ferrell is the original voice of Ted, Jeff Bennett is often thought of as the definitive voice for the character due to how many times he voiced him. This also applies to Frank Welker as George, since he voiced him in all projects.
Family-Unfriendly Aesop: Some Moral Guardians have been critical of letting children read the Curious George books; they feel that George usually gets off easy or with no punishment at all. This is alleged to give kids an unrealistic view of actions and consequences.
The original book depicts George smoking The Man In The Yellow Hat's pipe with no ill effects. Becomes a case of Values Resonance in the 1982 Stop Motion special where George tries the pipe and hates it, convincing The Man In The Yellow Hat to give up smoking in the process.
The Man In The Yellow Hat threatens to spank George in the animated short "Curious George at the Laundromat". That would come across as flat-out animal abuse today in an era where spanking was already a controversial form of discipline, even in 1980. When the episode was adapted into a picture book, The Man In The Yellow Hat instead says, "There you are, George. You've caused a lot of trouble. I'm taking you home."