"laconic style of chipping off his pronouns and auxiliary verbs..."See in text(Chapter I)
Heathcliff is relaxing his speech. Instead of saying "him," for example, he would say, "'im." He is also dropping the g at the end of verbs—"helpin'" instead of "helping."
"She looked at me, leaning back in her chair, and remained motionless and mute..."See in text(Chapter II)
Mrs. Heathcliff's inhospitable behavior signals that something is fundamentally wrong in this household that has nothing to do with its geographical isolation.