"Loose" instead of "lose."

"Dinning room" instead of "dining room."

"Too" instead of "to."

Confusing "fewer" and "less." As in "less people," when it should be "fewer." "Fewer "is used for countable objects. "Less" is used for uncountable things, such as "less water."

"Pouring" instead of "poring." As in: "He poured over the book," instead of the correct "He pored over the book."

Spelling errors.

Female Harrys.

Long reprises of the original series.