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.
Conrad: Whatever.
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?