The ghosts are caught by a trap that periodically appears and give rewards based on their color:

white - no reward
red - spinner
orange - 2x clicker bonus activation
yellow - 2x speed bonus activation
green - 2x income bonus activation
blue - gem
violet - 100x clicks worth of screams

When bats start flying in the background, you can click on them for bonuses. Each bat clicked in the same swarm increases these rewards.

1st bat - 25 clicks worth of screams and progress towards next bonus
2nd bat - 50 clicks worth of screams
3rd bat - 100 clicks worth of screams
4th bat - 200 clicks worth of screams
5th bat - 1 gem

Note: The Oogie Boogie event bats do not count towards this as they have separate rewards.

The wisp periodically appears flying around the upper floor of the front hall and gives rewards based on their color when thrown into the fireplace:

red - scratch ticket
orange - 2x clicker bonus activation
yellow - 2x speed bonus activation
green - 2x income bonus activation
blue - 100x clicks worth of icicles
violet - gem

In the bunker, water spawns periodically to be used on the dirt below the bunker. Each use of water reveals a single tile. The goal is to reveal the hidden images.

The list below gives the image size (Columns x Rows), the image, and the reward for revealing that image. After all 8 images are revealed, it restarts.

(1x2) Ghost - TP
(1x2) Green Splosion - x2 clicks bonus activation
(2x2) Brain in Jar - scratch tickets
(2x2) Skull Pile - TP
(1x3) Skeleton - scratch tickets
(2x1) Bat - 2x speed bonus activation
(1x2) Grave - scratch tickets
(1x2) RIP Grave - TP

Note: Since the smallest size an image can be is 2 tiles, a strategy for finding them all faster would be to select tiles in a checkerboard fashion.

Bath bombs come in a variety of colors and appear on the sink or medicine cabinet.

red - creep
orange - gem
yellow - speed x2 bonus
green - click x2 bonus
blue - 2 pipe tokens
purple - income x2 bonus