Most likely due to the criticisms of the long loading times in the first release, The Wrath of Cortex's Platinum/Greatest Hits re-release had shortened loading times.
Within the game's data is an unused level called "Fire Island". The level is a path of red terrain with a few bridges, and no enemies or crates. The background consists of a few volcanoes and lava geysers. The only way to access the level is through hacking the game.
During development it would appear that in part of the level "Crash & Burn", Crash would have had to save Coco from a hanging cage. Even though this task was removed from the final game, the cage is still present in the finished level, although Coco was replaced with a skeleton.
While a lot isn't known about Mark Cerny's vision for this game, an animated video representing the proposed gameplay was made. Even though this is from long before the actual development began, the level in this video does strongly resemble the level "Crash and Burn".
The game actually started out under the direction of Mark Cerny (producer of the past games) exclusively for the PlayStation 2 and was initially intended to be an open world adventure. After Universal Interactive (the holder of the IP) decided to take the series multi-platform, and have Traveller's Tales develop it, the decision was made to use the more traditional linear path level design.
If you start a new file with the name "WOMBAT" you will get an immediate 106% completion rating. This is a reference to Crash's name before they named him Crash, aka Willie the Wombat. This does not work on the PS2 version of the game.