He probably pointed out that they looked similar because Stryver asked one of the two accusers after being given the note, if he had ever seen someone that looked like Darnay before.
We can infer that it had something to do with their appearance.
And you could have mentioned that this is from "A Tale Of Two Cities"
Answer:
id go to Hawaii and just relax the entire time and swim and my super power would be mind reading
Answer: I believe it is Bilbo leaves Bag-End, Bilbo sees Rivendell for the first time, Bilbo meets Gollum, Bilbo travels through Mirkwood, Bilbo meets the dragon.
Hope this helps!