When Blair is leaving Paris, she is wearing the heels she had previously given away to the prince.
Blairs say 'I could care less about Chuck', a grammatical mistake by Leighton Meester; the script read 'I couldn't care less about Chuck'/
Chuck was shot on his left side and he uses his walking stick on the left side, a walking stick is used on the non injured side to aid in weight distribution, to ease the pain the injured side.