The little girl swimming alone
Definitely a no -no. I liked the movie, but this part bothered me. Was not sure how old the girl was, but she did seem relatively young, too young to be swimming in a pool without adult supervision. The mother did state that she did not let the girl go, that the girl was being trouble, but that is when, as a parent, you pull out a can of whoop-@ss and forbid it. She could have drowned.
"Duh. You're the idiot. Not me."