The answer to the quiz question that is asked regarding the alphabet is "Q"
The mean father walked to the phone booth with the knife in his stomach. He left the knife in so that the bleeding wouldn't increase. So, when he called emergency and then fell to the ground, he was quite likely still alive. The ex-criminal pulled the knife out of his stomach so that he would not be implicated in the murder. It is possible that this caused more bleeding and therefore the angry father's death.
Naomi says her home is the island of Saint Barnabas, which Marlon states is the smallest in the Caribbean. It's as fictional as Saint Marie, and the "real" smallest island in the West Indies is Saba, a municipality of the Caribbean Netherlands.
An incident early on answers the question of who would win in an encounter between Harry the lizard and Henry the Hoover. The series' little green mascot walks away without a scratch on him, but the writers show they know how invested the audience has become in his occasional misadventures.