Joke #1: What's So Funny?
Ole is dying but would like to eat one of his wife's famous brownies before he dies. Lena won't permit it because the brownies are meant for the guests who'll be attending Ole's funeral. Scandinavian immigrants are often seen as very practical people. In this case, Lena is being a practical host after Ole's death instead of being a kind, loving wife while he is still alive
Joke #2: What's So Funny?
Scandinavian immigrants are stereotyped as using few words to communicate. Lena gives only the bare details to the obituary editor: Ole died. Most people would expect a short history of his life and his interests, so this is abruptly funny. When the editor asks if there is more information (because a few additional lines won't cost more money), Lena adds: Boat for sale. Again, she uses few words and is sounding more practical than loving in order to sell Ole's old fishing boat.