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
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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