"He's the guy that led the team ..." She's the "girl that wasn't willing ..."
These errors, if errors they are, did not interfere with my enjoyment of the story that contained them. But you can bet that Mrs. Higginbotham, sixth grade English teacher, would have downgraded a paper that contained them.
Her rule was that you refer to people and animals with names using the pronoun "who" - not "that." So, if her rule is correct, it should be "He's the guy WHO led the team" (capitalization mine for emphasis). Mrs. Higginbotham also would have made it "Trigger was the horse who Roy Rogers rode into fame." (an animal with a name.)
Is this even an error today? If you consider it an error, is it serious enough to downgrade the score you give a story? (My opinion - it's a minor error not serious enough to make me downgrade a story).