score:3
Because he wasn't refused entry, he's free to try again.
He'll need better evidence of his ability to support himself. I suspect the border officer's issue with your father's friend was that he didn't know your father well enough to know his complete name, which probably cast a doubt on the story. If your father will be staying with someone else, get enough information together to make it clear why this makes sense, how they know each other, what the purpose of your father's visit is and why the friend is willing to help. Because some people come to Canada to work illegally, customs officers expect the reasons to make sense.