Resident Evil 4 Limited Edition Pak

To do this, you need at least one normal weapon, and the Infinite Rocket Launcer.

At the begining of each chapter hit an enemy with any weapon once (any weapon other than the IRL) You can then fire away at anything with the Rocket Lancher, no matter if you hit or miss an enemy, and you will get 100% hit rate at the end of the chapter.
This happens because the game does not register the Rocket Launcher hits like the other weapons hits.

After your second encouter with The Village Chief head straight back to the previous room where you met him. A scene will occur where Ada saves you from The Village Cheif again.

After you watch the credits at the end of "Assignment Ada" it will ask you if you would like to watch the credits again. Choose "yes" and it will play the credits again but with different music.

In the castle area, right after engaging the Bugs in the sewers, you will see a large group of Ganados Zealots in mid prayer. If you spook them they will run away, and you miss out on ALOT of money. Right before the sewer they give you a flash grenade. SAVE IT. When preparing the ambush on the congregation, go north then swing across the chandelier. When on the other side look down, and try to hit them all with a flash grenade to stun. Immediately jump down and run north to their exit point so you lock them in. If you have an incendiary or frag grenade you could use it here, other wise line them up for some shotgun carnage. They will each drop a spinel and their leader drops an Illuminados pendant, worth around 32000 altogether.

After you enter the Castle, and go through the Hall of Water(Y' Know.... that place that you have to protect Ashley as she turns the Cranks) to the Observation Hall. Next to the Merchant, A blue door with golden gun engravements lies in wait. Go through the door and begin the Target Practice game. Select Game Type A to begin a game. During certain portions of the game, other blue doors similar to this can be found. Enter them and finsh the Target practices by fetting 3000 points or higher to get 6 bottle caps. After you get 6, talk to the merchant and end the game. If you collected 6 different caps of the same game type, you will get some pesetas.

In the hall south of the hedge maze there is a locked door. Return to that area with Ashley, piggy back with her and she will unlock the door.

When you reach the underground Castle area in which you have to fight two El Gigantes, you can bypass this difficult fight entirely. Climb the ladder and ride the zip line down to the trap door switch. Run back and do this over and over again really fast. Eventually you'll be able to get to the zip line before the actual zip line does, and riding it down will trap you inside the wall. From there, turn right and walk through the wall past the locked door. This bypasses the fight entirely, because you're glitch-walking behind the spot where the cutscene for the fight is supposed to take place.

When you first enter the area where you fight Del Lago, the monster in the water, head down to the dock. If you shoot the water about eight to fifteen times, you will get see what he thinks of you.