- Extra nitrous power
Successfully complete all Racing secondary missions to get increased nitrous power.

- Psychonauts reference
In the first cutscene, where you are given the options to toggle the blood gore and swearing, just before Eddie says the line that leads to the option of turning on or off swearing, he sees one of the band members dancing on a very shaky ledge. While that band member is dancing on that ledge, he will be chanting a song that was originally done in Psychonauts by some kids in a few parts, but most notably by Raz himself in the level where you have to fight four wrestlers to get a card. At the end of each match after they were defeated, Raz did the same dance and chant song.


The headbanger that wears the goggles at all the Death Rack missions sounds identical to Raz, but slightly deeper.

- Rob Halford reference
Rob Halford plays General Lyonwhite even though his last name is Lita and Lars'.

- Trophies
Successfully complete one of the following tasks to get a trophy:

Bronze Trophies
Protector	Finishd 20 ambush, outpost defense, or mortar secondary missions.
Master of the Flame	Double Teamed with every Ironheade unit.
Squeal Like a Chicken	Finishd all racing secondary missions.
Got a Car and a Date	Finishd 'Welcome to the Age of Metal'.
Flowerslave	Summoned all Motor Forges.
Dollpocalypse	Hit 6 enemies with the explosion from a Brood's Double Team.
Painkiller	Killed 25 enemies with the grinder of one Rock Crusher.
Master of the Blood	Double Teamed with every Tainted Coil unit.
Tourist	Watched all vistas.
Now You Must Tell the Tale	Watched all Legends.
Chicks n' Booze n' Stuff	Finishd 'Sanctuary of Sin'.
Virtuoso	Learned all guitar solos.
Coolest Thing Ever	Jumped over a Hextadon in the Deuce.
Six Degrees of Schafer	Played with or against another player who has this Trophy.
Beast Master	Rode every animal in the world.
Armchair General	Won a Stage Battle by yourself against the AI without attacking.
Serpent Spanker	Freed 80 Bound Serpents.
Some Demon Flesh on your Bumper	Slayed 150 enemies with the Deuce - any mode.
Iron Fist	Won an AI Stage Battle - Brütal difficulty.
Quill Tosser	Killed a Tollusk using only Ground Urchins.
Victör	Won a ranked multiplayer match.
French Kiss Instructor	Finishd 'Pilgrimage of Screams'.
One Hit Wonder	Purchased 1 upgrade in the Motor Forge.
Master of the Tear	Double Teamed with every Drowning Doom unit.
Ran to the Hills	Finishd 'It's Raining Death'.
Voices From Beyond	Unlocked all songs in the Mouth of Metal.
Silence, groundwalker!	Gained 5 or more seconds of hang time in a single jump - any mode.
Ringleader	Trapped 15 enemies in one ring of fire with the Fire Baron's Double Team.
Practice Bloody Practice	Won an AI Stage Battle - any difficulty.
Hair Remover	Finishd 'Battle for Bladehenge'.
Serpent Samaritan	Freed 40 Bound Serpents.
Euthanasia	Hit 15 enemies with one Agony Ball using the Pain Lifter's Double Team.
No More Tears	Finishd 'Sea of Black Tears'.
Begin a Revolution	Finishd 'Exploited in the Bowels of Hell'.
Overkill	Finishd all hunting secondary missions.
Fistfull of Fog	Finishd 'Dry Ice, Wet Graves'.
Thick as a Baby's Arm	Finishd 'Lair of the Metal Queen'.
Death From Above	Killed 20 enemies with one Bleeding Death.
Silver Trophies
I've never touched an axe before	Personally smote 300 enemies - any mode.
Boar Bather	Rode a Razorfire Boar into the Sea of Black Tears and live to tell the tale.
Roadie	Finishd Campaign mode on Normal Difficult Level.
Loyal Customer	Purchased all upgrades in the Motor Forge.
Sellout	Spent 250,000 fans - any mode.
Favored	Acquired 3,000 Fire Tributes.
Subjügator	Won 10 ranked multiplayer matches.
Serpent Savior	Freed all 120 Bound Serpents.
Legend	Finishd Campaign mode on Brutal.
Groupie	Finishd Campaign mode on Easy Difficult Level.
Gold Trophies
Metal God	Achieved 100% completion on the stats screen.
Cönquerer	Won 50 ranked multiplayer matches.
Platinum Trophies
Rock God	Got all PS3 trophies.

Bronze Trophies
Hammer of Infinite Fate Tourist	Played a multiplayer game on all Hammer of Infinite Fate multiplayer maps.
If You Want Blood, You Got It	Killed 20 Tainted Coll units with the Disgorger.
Cry me a River	Killed 20 Drowning Doom units with the Eye of Sorrow.
A Face Like a Beast	Killed 15 enemies with a Metal Beast while wearing the Zaulia Threads.
Hammer of Fate Champion	Won 10 games on Hammer of Infinite Fate maps - ranked or vs. Brütal AI.
Norwegian Sendoff	Visited the grave of a fallen hero while wearing the Black Metal Threads.
Carnivore	Ran Down 20 animals in the Deuce with the Colling Maw equipped.
Beard Beard Action Beard!	Made out with Ophellla while wearing Mountain Man Threads.
Whispering Rock	Chiseled four Razputin heads onto Mt. Rockmore.

- Spike-Quilled Axe
Successfully complete all Hunter secondary missions to unlock the Spike-Quilled Axe. Notice: The Hunter is located near the large stone cross in the Grasslands, and he will move halfway through his missions to the Ice Barracks. Once you complete all Hunter secondary missions, return to the first place you met him, and he will give you the Steel-Quill Axe.

- Final interactions
Successfully complete the game. Then, go to one of the following locations to find the corresponding character(s) and have a final interaction with them:

Ophelia	In front of the large stone cross near The Hunter in the Grasslands (located to the left of the huge sword on the map). Eddie will ask if she wants to make out. A cutscene will play of the two kissing until you press [Interact] again.
Lita	In front of Lars's tombstone at the cemetery. There will be a brief cutscene where you share a moment of silence with her. The moment will last and the time of day will shift until you press [Interact] again.
Mangus	On top of the large sword in Blade Henge. Notice
Rima	On top of her tower in the jungle
Infantry/Army	At the Beach Party
Fire Baron	In the jungle directly north of the tree island at the bottom of the last continent. He is to the left of the main road as soon as it turns, traveling south to east.
Thunderhogs	At the Kill Master's Lair. You can drink with his bassists and comment on Lemmy's bass playing ability.

- Riding the animals
All animals as big as Eddie or larger can be ridden. Hit a creature with a bolt of lightning to stun them. Then, get near them, and press Triangle. While riding them, press X to perform an attack specific to that creature. Raptor Elk and Tullusks are a couple examples of creatures with melee attacks, while the Laser Panther shoots lasers from its eyes. The large wooden horse creatures in the final map area (with large swinging axes for tails) can also be ridden.

- Kyle Gass reference
The man at the Mortar missions has the same facial features, hair, and voice as Kyle Gass. Kyle Gass is the lead guitarist and vocalist of Tenacious D and the Godfather of Jack Black's son. -From: Tyler Murphy