That's not a typo error because it really is Holliday.
Holly Holliday will be introduced on Glee's 7th episode, "The Substitute". Played by actress Gwyneth Paltrow, Holly is Mr. Schuester's substitute teacher when he gets sick.
As the New Directions gears up for Sectionals, teachers get sick, literally, and substitutes were hired. Holly for Mr. Schuester and Sue Sylvester for Principal Figgins. Yes! For real! Of course, Rachel, the doubtful yet talented one does not agree with hiring Holly for reason only Rachel could think of. Good thing, Holly can sing. And sing she did, singing Cee Lo's "Forget You". Here is video one for proof.
Plus a sneak peek of "The Substitute" as video two.
See yah later!