Clockwerk is a secret Easter egg in many levels.
Not counting remasters, this is the first game in the franchise to be developed by another company besides Sucker Punch Productions.
As of November 2023, this is the only game in the franchise to never be released in Japan. (The previous game did not receive a Japanese release on the PlayStation 2, but it did get released in Japan when remastered for the PlayStation 3.)
When sly was crawling in clan of the cave raccoon two guards were talking about me paradox, one mention he yanked this one guy tusk just for fun, this is a similar line from toy story (1995).
The game would have had a horseshoe game mode like the original game but was scrapped due to time constraints.