"And what are Slytherin and Hufflepuff?" "School houses. (1) There's four. Everyone says Hufflepuff (2) are a lot o' duffers, but --" (Harry Potter and the Sorcerer's Stone)
I guess, there’re is grammatically proper instead of (1)-there’s; but I’m not sure for (2)-are. Because are can be used except when Hufflepuff is regarded as a collective noun, I think. Would you let me know how to use the verb grammatically right?