Credits
Successfully complete the game, and you can view the staff credits at the 'Features' menu of the game.

Extra Health
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.

Rare And Microsoft References
When you start a new game, look at the three books that are shown. One says 'Rare' and the other says 'Microsoft'. If you look closely, you can see that when 'Rare' books pages are turned, there are pictures of Banjo Kazooie and Donkey Kong Country. In the 'Microsoft' book, you can see an Xbox, an Xbox Live microphone, and other Xbox items.

Mini-games
For every five 'Rare books' that you find, you will unlock a bonus mini-game at the mini-game screen. There are 100 'Rare books' in the game, which unlock a total of twenty bonus mini-games. There is one 'Rare book' in every room of the mansion.

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

Hidden FMV sequences
Complete Challenge #21 to unlock the 'Original Promo Movie' and 'Deleted Scene - Crivens Gives The
Chair' options in the replay storybook.

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

Easier Way To Beat Baron Von Ghoul
After Baron von Ghoul throws ghoulies at you, he will speed up. Once you defeat all the ghoulies, he will charge at you non-stop. An easier way to stop being pushed back, and losing health are two things: Get the invincibility can, or hide behind large objects. (Such as the bathtub.)

Mumbo Jumbo
If you look in some of the rooms, there will be a picture of Mumbo Jumbo from Banjo-Kazooie and Banjo-Tooie.