Revealing mistake: When Payne has the grenade, the top is blue. Indicating a practice grenade.
Revealing mistake: During the first few minutes of the film when Major Payne reports into the general, his belt loop on his Service Alpha uniform is way off regulation. He has the belt loop hugging the belt buckle when it is supposed to be aligned with the end of the blouse pocket. (00:03:20)
Answer: The credits are in alphabetical order (according to last name). He did get top billing in the opening credits though. Damon is actually listed 25th in the end credits, after his nephew, so I don't know what you saw where he was listed 7th or 8th.
Bishop73
I have the movie, and his name is right after his nephew's, so I guess I got the place wrong.