Question: Did Joe kill the guy in the hotel that he stole the money from?
Answer: Probably not. The man was a masochist who derived sexual pleasure from being physically abused. Joe apparently crammed the phone receiver into the man's mouth and left, unknown if he died from it or not.
Answer: Coconut.
No, we see them trying to break the coconut (and failed miserably) after Ratso made that dish (and it looks like some kind of stew, probably made from the tomato we saw them steal at the same time they stole the coconut, and green peppers).