You fight Crying Wolf in the same place you fought Sniper Wolf.
You can find the Hind D still in the Snowfield where you fight Crying Wolf.
If you switch your controller ports when your television switches to HIDEO 2 during the Mantis fight, Otacon will come on the Codec and let you know that the trick does not work twice. You will also get a suggestion about destroying the bust.
After you die during the final Boss battle and choose "Exit", it quickly changes to "Exist". Liquid Ocelot says "Not yet Snake, it's not over yet" and it moves the pointer back to "Continue"a reference to a quote by Liquid in the original Metal Gear Solid.
Attack Meryl during the Act 1 FROG attack sequence to have her say the same things she said when you attacked her in Metal Gear Solid.
When you die in Act 4, the "Game Over" music from the first Metal Gear Solid will play.
The password Johnny puts in to disable the laser trip trap is "MERYL SILVERBURGH".