At the start of Chapter 4, when you are asked to go back to your room by the Doctor, search the room across the hall from your door. An Xbox 360 is hooked up here with a game you may recognize.
Your character, Alan Wake, sometimes lingers in the center of the screen despite you clicking on the movement stick (L3 or R3). To move him to the side of the playfield, press the viewing stick all the way left or right until Wake rotates completely once. This should push his body to one side and you can see what the hell is in front of you.
Just in case you are wondering about how much stuff you can carry: Batteries x20 Revolver rounds x42 Shotgun shells (both versions) x32 Rifle rounds x25 Flaregun ammo x12 Flares and Flashbangs x20 (each)
In Episode 4 there is a modern art painting on the top floor of the lodge. It is actually a tag. Take your smartphone, aim it at the tag on your screen and use Microsoft Tag to read it.
In Alan's New York Apartment and various other locations throughout the game, examine bookshelves: One of the titles is "The Things I Want" which is a chapter title and monologue sequence from Max Payne 2.
Achievement/Trophy Tip: Secret Area for "Creative Space" (The Writer DLC)
When you come across the downed airplane, get on its wings and then drop below. Head towards the front of the plane. You should come across a hidden hole. Follow the cliff to a cave and inside you'll find a giant typewriter. Climb the typewriter and read the paper.