Other mistake: After completing a few tasks at Lon Lon Ranch, Link is rewarded with a dairy cow of his own. But somehow, the cow magically just appears back in his house back at Kokiri Village. His house is basically a tree house way in the air accessible just by a ladder. And the doorway is only big enough really for a small child to enter. Yet somehow a full sized cow is now in the middle of his house. And survives without any grass or water inside.
More trivia for The Legend of Zelda: Ocarina of Time
Question: Link was an infant when he was delivered to and raised by the Kokiri, who don't age. When Link becomes a child, they should've realised that he wasn't a Kokiri because he aged. Why didn't they see this?
Answer: Because the Kokiri don't age past a certain age, but they do age up to that age. Link looked roughly the same age as the other Kokiri when his adventure started, which is why they never noticed that he was different.