Chuck's passport lists his full name as "Charles Bartholomew Bass", his birthday is 19th January, 1991 and his place of birth is New York, NY.
Although never in the same film, Clémence Poésy (Eva Coupeau) and Christian Coulson (Ivan) are also in the Harry Potter franchise respectively as Fleur Delacour and Tom Marvolo Riddle.
Charles' passport shows that he was 15 at the time of its issue. American passports are valid for five years for persons aged 15 or younger, but Charles' is valid for 10.
Blair laughingly comments that the only thing likely to upset Nate is a badly-rolled joint. The Nate of the novels maybe, but Nate as portrayed by Chace Crawford here, regularly gets upset about everything affecting friends and family, just like the others in his group, and is certainly not the stoned character of the original book.