In The Game, There are two dates mentioned as Nicholos' birthday.The first one is October 11th, which is mentioned while Nicholas and Conrad has a chat at the hotel.
Conrad: and all the sudden it click... October 12th...Nickie's birthday.
Nicholas: October 11th.
But, at the end of the movie the birthday invitation shows it's October 20th.
Which one was Nicholas' real birthday date?
Does it mentioned intentionally wrong?If so,What was the purpose for that?