During the level "Dark Woods of the Serpent", you may encounter a secret area obtaining a very aggressive and deadly white rabbit. Lo Wang will comment on him saying "that's no ordinary rabbit". The rabbit is protecting a cave with the Holy Grail that you can blow up. This is a reference to the 1975 film "Monty Python and the Holy Grail".
Contributed by shaggytoad
Behind a secret wall which can be destroyed by blowing up some nearby TNT barrels in "Dark Woods of the Serpent," You can find Lara Croft chained up in a cell. When you approach her, Lo Wang will comment, "She's raided her last tomb." Inside her cell there is also a fortune cookie.
Contributed by gamemaster1991