When killing Raptors with Dylan's Shotgun, you can save ammo by waiting for the Raptor to jump up in the air towards you. When it is in midair, blast it away. This move only consumes one bullet instead of the standard two or three.
Before leaving the jungle, you can retrieve the card from the shallow stream. This way you will not have to make a return trip after finding out that it is needed.
Instead of investing in the heavy machine gun, purchase the Twin Submachine Guns, and upgrade its amount of ammo. It is more convenient than the Heavy Machine Gun because of its dual target capability.
Successfully complete the game once to have Dylan in the background. Successfully complete the game two times to have Regina in the background. Successfully complete the game three times to have Paula in the background.
Successfully complete the game once. The Dino Coliseum allows you can fight against all of the dinosaurs from in the game in a coliseum arena.
Purchase Rick, Gail and the Tank for the "Extra Crisis" games. Another set of dinosaurs will appear at the character selection screen for purchase.
Purchase all the other characters and dinosaurs for the Dino Coliseum and Dino Duel. The Triceratops and the Compsagnathus will be unlocked in hard mode.
Successfully complete the game after collecting all eleven Dino files. The EPS Platinum card will appear at the save game screen. Unlimited ammunition will be available the next time the game is played.