In Snow Go, Snow Biz and Piston It Away, the camera won't move and the ground far from the bonus round won't be solid and Crash will fall. However, in Cold Hard Crash, the camera moves as it does when doing the level normally and it's actually possible to finish the level while the game still shows Crash as being in the bonus round.
With this glitch, the word "BONUS" appears at the top of the screen like it does when Crash is in a bonus round. The boxes get added to the bonus round total, while wumpa fruits and lives get added to the game total, although whenever Crash picks up wumpa fruits and lives, the icons go to the bottom like they would in the bonus round.
If Crash steps on Cold Hard Crash's death route platform, the game will exit "bonus round mode" and the boxes will be added to the box total.
The only level with a bonus round in a side scrolling section where this doesn't work is Spaced Out, because the game does not consider Crash to be in the bonus round until he gets very far down.
This glitch may come in handy if the player doesn't want to lose a life. Hence, it's a bonus round and the player never loses a life by dying in a bonus round.