Grabbed by Ghoulies Cheats

Enter the options screen and enable the "Butler's Brew" option. Now if you fall in any room, you will be given an option upon re-starting that room if you want Coffee and Waffles. Press A to select "Yes" and you will have double health.

In the Embassy Ballroom the second time, kick the mirrors on the side of the hall to get a freeze can. This freezes the ghoulies and skeletons while you kill them.

Pick up an object and throw it across the room. You may need to try this a few times, you will soon be able to hit the location where a mummy appears (which has a smiley face). Mummies are invincible, but when he runs out of ghouls he will come after you if you attack him.

You can see various pictures and statues of Banjo-Kazooie's "Mumbo Jumbo" in the rooms of the mansion.

Whenever you fight a "Ghoulie", listen. They often sound like creatures from Banjo-Kazooie.

Every time you enter the kitchen where Ma Soupswill is located, look on the billboard near one of the kitchen's doors. You will see a picture of Banjo and Kazooie.

Get a Platinum Medial in Challenges #1, #3, #5, and #7 to unlock concept art pages.

For every five "Rare books" that you find, you will unlock a bonus mini-game challenge at the mini-game screen. There are 100 "Rare books" in the game, which unlock a total of twenty bonus mini-game challenges. There is one "Rare book" in every room of the mansion. Challenge #21 is unlocked by completing the previous twenty challenges with a "Gold" or "Platinum" rank.

After finishing Challenge #21 you will unlock the "Original Promo Movie" and "Deleted Scene - Crivens Gives The Chair" options in the replay storybook.

Finish the game, and you can view the staff credits at the "Features" menu of the game.