What do you think might be on the note that Sydney Carton passes to Mr. Stryver during the testimony of the witness? How does this change the outcome of the trial? (Book 2 Chapters 1-6)

Sydney Carton passes a note to Mr. Stryver, the defence attorney. The note basically states the resemblance between Darnay and Carton himself. Due to this resemblance, there is no proof that Darnay is the spy so he is ruled not guilty.