Getting the Grapplejack
Get the grapple in the Phoenix Mountain. Then, go to the top of Watchtower, push the rock to the left, and take the mirror, Take a crystal ball in the Watchtower, jump to the left side after pushing the rock, then take the other in the Wobbly Wharf. Then, take the one in the Charity Square. Go to Masakari Jungle and talk to the miners in the "Y" crossing after the "I Need A Power" event. Go to the Village Of All Beginning and open the door in the hut.

Pig Bags
The following are locations of the Pig Bags and their corresponding Pigs.

The Fire Pig Bag is in the 1000 year old chest at the begining of the Lava Caves.
The Fire "Green" Pig is behind the smile door on the Haunted Mansion.
The Haunted Pig Bag is in the Large Key Hole Room on the Haunted Mansion.
The Haunted "Pink" Pig is directly above the entrance to the Lava Caves.
The Stormy Pig Bag is behind the Big Key Hole door on Stormy Mountain.
The Stormy "Red" Pig is in Charity Square up and to the left.
The Mouse Pig Bag is in the 1000 year old chest at Baccus Town Hall.
The Mouse "Orange" Pig is left of the tall tree in The Jungle.
The Jungle Pig Bag is in a 10,000 year old chest on Old Tree Hill.
The Jungle "Navy" Pig is by the entrance to The Familiar Mansion.
The Underwater Pig Bag is in a 10,000 year old chest in the lower right of the Underwater Maze.
The Underwater "Yellow" Pig is in the Clock Tower in the Village of Cililization.
The Evil Pig Bag is given to you by the Dwarf Elder.
The Evil "Blue" Pig is in the 1 million year old man's room in the Underground

Restore health
Since the game does not save your health status, simply save, quit, then restart from the saved game file to restore health.

Alternate hair color
Hold [R1] + [L1] + [Select] + [Square] and press [Left], [Down], [Right], [Up], [Up], [Right], [Down], [Left] at the options screen.

Extra weapons
Begin a new game and wait until the loading screen that feature the dancing pigs appears. Then, hold [R1] and press [Select], [Right], [Left], [Down], [X], [Circle], [Start]. Finally, press [Start] when loading has completed.