Revealing mistake: No one dressed as Tony D'Annunzio could swing a golf club, and the "swing" he does produce wouldn't send a ball very far.
Factual error: In the ending credits where the music used in the film is listed, Neal Schon's first name is misspelled "Neil".
Continuity mistake: At the very beginning, when Danny is talking with his dad, in the close-up just after he says, "30 bucks less tips," his spoon is putting sugar in the cereal, but from the back his spoon is in the sugar bowl. Also, the little glass goes from being in front of the dad's hand to behind his hand, in the following shot. (00:02:30)
Answer: It's a single boxed golf ball.
ChiChi