Many things were cut from Crash Twinsanity during the games' development.
N. Sanity Island (Segment 1)
In the first segment of the open-world hub titled "N. Sanity Island", which took place on N. Sanity Beach, several major things were cut.
In the instruction manual for Crash Twinsanity, there is an image showing the game when paused. Look at the upper right side of the image and you will see a grassy hill with Wumpa leading up to a gem at the center of the hill.
The Blue Monkeys encountered near the Wumpa Trees would have originally attacked Crash, but they don't now.