Unanswered questions (spoilers)

Why did Mr. Jones steal the guy's backpack in the first place?

Why didn't they just go to Mr. Jones and attempt to speak with him face to face after they found out who he was?

What kind of meds was Scott on? And for what?

Why did they talk about walking around naked but then never got naked?

Whose house were they staying in and why didn't the owner know about Mr. Jones?

Why did Scott steal the "baby" piece of art?

When he was in the caves, lost, and he shined a flashlight into the shadows and saw the arm, who was that?

Why didn't the sun rise?

What was with the birds being flung into the house?

How were they able to live without ever eating?

what was the point of that montage at the end?

How did Penny know the world outside the door was the nightmare world?

How was the filmmaker able to craft an ending so boring I literally dozed off during the last few minutes?

How did it end?