Question: Since Eggs could talk normally, and wore regular human clothing, should he have realised that he wasn't a Boxtroll the entire time?
Question: Despite all of the townspeople being shocked after Eggs reveals Madame Frou-Frou's true identity, why was Lord Portley-Rind more upset about Eggs accidentally knocking the cheese wheel into the lake?
Answer: Because he had a crush on Madame Frou Frou.
Question: What was the reason for Eggs' gross behavior at the ball, such as licking a woman's hand, and eating some cheese topped with a ladybug?
Answer: He was raised by the Boxtrolls so he would have picked up not only their behavior and mannerisms but also their eating habits. To Eggs, the way he is acting is completely normal but to everyone else completely disgusting.
Question: Archibald Snatcher's main goal is to exterminate the Boxtrolls, but why did he also try to get Eggs killed? Eggs is a human.
Answer: Snatcher wants membership in the White Hats and is ready to sacrifice anyone plus Eggs is proof that Boxtrolls don't kill humans.
Answer: No because Winifred told her her proper orders.