How exclusive can the Billionaire's Club be? Among those seen fleeing its island: three of Middleton High's more ubiquitous students and three of the Mad Dog Squad's cheerleaders (including the mysterious Ponytail).
When Kim goes to cheerleader practice, she goes through the single door of a Middleton High classroom yet when she gets to the other side they're the double doors of the gym. Someone could say that is not actually a goof because the two shots are not
technically consecutive, but the intervening shot is
Ron blinking his eyes twice, and there is only one sound of a door opening and closing.