"For an Italian kid, you ain't got a bad butt" - Written by Stallone...about his 13 YO son?!?!
Why was this written into the movie?
Sure it's a school girl saying it to the character of Rocky Jnr., but that doesn't negate the fact that this line came from Stallone's mind, and made its way to screenplay, filming, editing, and to the viewers.
Sage Stallone was 13 when this was filmed.