Later revisions of the NTSC version of the game had a specific monkey's name and description changed, possibly out of fear of copyright infringement. An ape named Freeto with the description, "Needs clean underwear" is changed to Quiff, with the description, "Bad fur day."
Contributed by Regen-33
The game was notable for being the first PlayStation game that required the use of Dual Analog type controllers. The left stick was used for precision movements while the right stick was used for various gadgets.
Contributed by raidramon0
The European version of the game disables controller input on the main menu if it detects itself to be a copy. The player may only skip the intro and view the title screen. The downside of this is that it prevents the European version from being played on a PlayStation 2 or 3 due to the software emulation setting off this measure.
Contributed by Mr. Kite
In the Japanese version, cutscenes can only be skipped with Start. In the international versions, cutscenes can be skipped with Start, X, or O.
Contributed by Mr. Kite
In the level Dark Ruins, there are four monkeys that are named Kyle, Stan, Kenny and Cratman, after the main characters of South Park. It's unknown why Cartman is misspelled as Cratman.
Contributed by gamemaster1991