When Hiccup shares his plight with Mirabel — that he's fundamentally different from the rest of his people and that his attempts to help only alienated him further — is when she cuts him off with a hug.
When Hiccup assures Felix that Toothless was just spooked by the large crowd, his mind immediately goes to Dolores.
Internal Reveal: Hiccup tells Antonio (who tells the rest of his family) that dragons are real, and that his homeland is full of them (even naming a few species of them for Antonio).
Puppy-Dog Eyes: Antonio is a frequent user of these, using them on his dad so that he could play with Toothless in the future.
