(1) Bert talks to Ernie that it's cold inside, so he gives him the coat, earmuffs, jacket, hat, and mufflers to make him warm. Bert is overheated, so Ernie gives him the icebag, he opens the window and he turns on the fan!
(2) The apartment of Ernie & Bert.
(3) Funny.
(4) The same ending music as "Cookie finds something that rhymes with buy".