Question: Has David Lynch ever explained why the beings in the lodge talk funny?
Question: Who or what is BOB? Where does he come from?
Chosen answer: Killer BOB is a demonic entity that emanates from a realm of pure evil known as the Black Lodge, a place that exists on an alternate plane of reality. BOB feeds on human pain and suffering and can travel on earth by possessing human beings and also as an owl. While possessing humans, he commits horrible acts to elicit pain, fear, and suffering from those who are around him, using that as nourishment. BOB possesses Leland Palmer, later forcing him to abuse, rape, and eventually murder his own daughter, Laura, and later to commit suicide.
Question: Why and how is Laura Palmer killed?
Chosen answer: Laura was killed by her father Leland, whilst he was apparently possessed by the spirit BOB. The exact manner of her murder is not clear, as several injuries found during her autopsy we later discover occurred during a separate incident before her murder. We know that she was beaten and killed in an abandoned train car, and her body was then wrapped in plastic and thrown in the river.
Answer: Why? Because her father was possessed by an evil entity. How? Blunt force trauma.
Answer: The answer to pretty much any question beginning with "Has David Lynch ever explained _______?" is: no.