If you find yourself stuck in a corner that contains two nearby objects it is possible to become trapped in the triangular space between the objects and the corner. To get out of this position take out your gun and walk forward or backward diagonally.
Save the game before the 'Mercy Kill Mom' video sequence and do not overwrite it. Continue until you complete the game. Start a new game and save it as another file. Return to the title screen, then load the saved game file before the 'Mercy Kill Mom' video sequence. This time, try to unlock another costume. Complete the game again, then save it as another file. You can overwrite the new saved game file, but never the saved game file before the 'Mercy Kill Mom' video sequence. Begin a new game again. Notice that another costume was unlocked. Keep repeating the process until you have unlocked ALL of the costumes.
After Travis has attacked Ellie with a chainsaw search the walls where you jumped an iron fence. There you will find the key to Room 301 which is located in the underground area. Inside Room 302 you will be able to recover ALL the weapons you obtained along with a med pack, health drink, and ammunition.
In the hotel, there is a hole in a wall (I forgot which floor) and inside you can read (through the hole) "Can't get it off." If you didn't kill the nurse while you're veiwing this message, she will attack you and you will be invisible until you turn off / on the flashlight.