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Although not referenced in game, Pecker is a Monkaw (half monkey and half macaw).
Contributed by BullZ'eye
During development, early ideas for new eco powers revolved around time manipulation. Although unused in the final version of the game, these eco powers are present in a preview build - Jak would've been able to manipulate time by accelerating it (increasing his movement and firing speed), decelerating it (slowing enemies down), or stopping it altogether.
Contributed by BullZ'eye
One mission went completely unused in the final build of the game, having Jak and Torn protect the city wall from a Metal Head invasion. The fight would end with Torn revealing his tatoos symbolize the guards' loyalty to the city.
The mission is present in a preview build of the game, complete with character dialogue and ending cutscene.
Contributed by BullZ'eye
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Design documents show that the relation between Jak and Mar was to be explored in more depth before the end of the game. In early plot revisions, Jak and Sig would discover Mar was a time traveller who vanished after founding the city.
Mar's time travelling device would've been found in the Underport.
Contributed by BullZ'eye
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The earliest iteration of Dark Jak would've made him faster, completely invincible and able to use items that would otherwise hurt Jak.
This would come with the added drawback of always ending the transformation with one hit point left.
Contributed by BullZ'eye
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Each civilian vehicle has its own name: One-seater vehicles are Zoomers, two-seaters are Flyers and three-seaters are Cruisers.
Contributed by BullZ'eye
"Construction Site" is a relatively unimportant level in the game, with only a cutscene being played there and little else for the player to do. It is very likely, however, that this level was at one point meant to have a bigger role in the game. The level has a lot of collision at places that are not normally reachable, and there are text entries for unused mission names, including "Climb Construction Site" and "Find Baron at Construction Site"
Contributed by BullZ'eye
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There is a picture of the developers hidden out of bounds in Haven City.
Contributed by BullZ'eye
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Near the stadium is a billboard of Ratchet and Clank from their appearances in Ratchet & Clank: Going Commando.
Contributed by ReakMayhem
Sandover Village can be accessed and explored though a glitch in the first cutscene. However, since the area was only meant to be used in said cutscene, the village does not have any characters and the levels Forbidden Jungle, Geyser Rock, Misty Island, Sentinel Beach, and Fire Canyon are inaccessible as there is nothing to call up for these areas.
Contributed by gamemaster1991