In Raveshaw's mansion, two Nod soldiers can be overheard talking about Raveshaw's Railgun Rifle, a weapon which was since removed from the level (it only appears in multiplayer for players who choose to play as Raveshaw). When the player gets to the spot they were talking about (it's also hinted at on the loading screennote The key to knowledge can be found in books.) they will find four laser rifles instead.
When Raveshaw is first introduced, Havoc claims that "Peewee and I have already met", referencing an event that didn't happen in the released game.
A couple of weapons seem to have had their models abruptly changed late into development, made apparent by pre-rendered cutscenes featuring completely different armaments from what's available to the player - the pistol is slimmer (highly resembling the H&K MP7), and Nod soldiers are seen carrying M16's with grenade launchers, for instance.
Bigger Bad: Kane, the leader of the Brotherhood of Nod. Havoc never meets him in person, but you can talk to his hologram in several of Nod's comm centers.
Bilingual Bonus: In the 'Deadly Reunion' mission, one optional objective tasks you with rescuing the resistance leader, Babushka. Babushka is Russian for grandmother.
Body Armor as Hit Points: Uses a dual-bar system, one for armor plates, the other for plain old HP. This system is for both Havoc on foot and for his vehicles.
Body Horror: Tiberium has a tendency to do this to humans. Assuming you survive exposure to Tiberium at all, the best case scenario is you spend the rest of your life as a deformed mutant. In the worst case, you become a horrible blob of flesh and mouths, called a visceroid.
Nod's Project ReGenesis attempts to use a controlled form of Tiberium mutation to create Super Soldiers. The results are nasty, but effective.
Boring, but Practical: In the "Obelisk of Oppression" mission, the easiest and safest way of destroying said Obelisk (which is an optional mission objective) is to shoot it with a captured Nod light tank while staying out of its range; it also works with any personal weapons (rockets, personal ion cannon, etc), but vehicles have infinite ammunition. The normal method (blowing the main frame in the bowel of the structure) also works, but the problem there is entering the structure without dying (it is an automatic defense tower shooting very powerful lasers at any enemy entering its range).
Level three has a Tiberium meteorite in a cave, surrounded by three machines of mysterious function, which you're tasked with destroying.
In the penultimate mission, there is a crashed UFO, presumably of Scrin origin, in the ruins. It is locked with a Level Three Security Door and contains a "Black Widow" Volt Auto Rifle.
Chef of Iron: You can sometimes find chefs in the mess halls of Nod bases, who will attack you with flamethrowers. And whom you can't kill in self-defense without getting a What the Hell, Hero? from your CO.
Cherry Tapping: With enough patience and dodging, it is possible to destroy a tank with the pistol. Or a building with the machine gun of a Humvee.
A screen in the opening cutscene is actually a screenshot from the first Command & Conquer game, Tiberian Dawn.
The Temple of Nod where the final level takes place contains the green screen studio where Greg Burdette made his fake news reports in the first game, the hacker bay used to take control of GDI's ion cannon network, the preserved corpse of Seth, and other temple locations taken from cutscenes in Tiberium Dawn.
Crew of One: In Renegade you can somehow pilot any vehicle all on your lonesome. Even the Mammoth Tank, which according to in-universe fluff normally takes a crew of eight. However, in multiplayer, it is possible for a second player to jump into your tank and take control of the turret for you (though this is disabled in almost all games).
Drought Level of Doom: "All Brains, No Brawn". A level which starts immediately after a Boss Fight (so, ammunitions are already somewhat depleted) and involves mostly Tiberium mutants, which are equipped with Tiberium weapons. So, when dead, they drop ammunitions for weapons unable to hurt them.
Duck!: During a cutscene, while Havoc and Sydney are arguing in a truck, Havoc simply says:
Eating the Eye Candy: When Havoc tosses Sydney a pistol, he warns her to try not to shoot him in the butt before walking way. The camera switches to Sydney's point-of-view, panning down to said asset before cutting to Sydney's face.
Elemental Absorption: Tiberium mutants and visceroids are healed by Tiberium-based weapons, like the Chemical Sprayer, as well as by walking through usually-harmful Tiberium fields.
Elite Mooks: The Black Hand, and later, the mutants created by Project ReGenesis.
Escort Mission: A couple of them, usually in the "escorting Too Dumb to Live NPCs" flavour. Escortees don't follow Havoc but have scripted paths with waypoints linked to specific areas crossed by the player. So, the escortees stay still until Havoc reaches a specific area, then rush to their next waypoint no matter if there are hostile units in the area or not. The Dr Mobius escort mission is especially guilty of this.
Expy: The standard assault rifle is basically the M41A pulse rifle, minus a working grenade launcher. It even has the same 100-round magazine capacity.
Faceless Goons: Most Nod mooks wear face concealing masks. Some GDI troops also wear masks, while others wear goggles.
Fake Balance: The multiplayer was balanced in that GDI and Nod each had an approximately equal chance of winning a given match. Other than that, you had infantry which were only worth a damn fighting other infantry, matches that devolved into neverending reverse tug-of-war tank battles due to the repair mechanics, Hit Scan snipers who could kill with 1-3 bodyshots, and so on. Ironically, it's been observed that this actually translated the RTS series quite well, given that tank rushes have been at the heart of it for years.
Forced Tutorial: The game is a strange example of the trope. There is an actual (entirely optional) tutorial, but the two first missions of the campaign have several gameplay tips appearing on screen, continuing the tutorial (or replacing it if the player skipped it).
Game Mod: Lots. The most famous being Renegade X, which eventually became a standalone game.
There's also mods which attempt to bring other games of the series into Renegade fashion, which includes: Reborn for Tiberian Sun and Firestorm, Red Alert: A Path Beyond for Red Alert 1, Apocalypse Rising for Red Alert 2 and (possibly) Yuri's Revenge.
Gameplay and Story Segregation: According to the lore information readable from the main menu, the chemical sprayer is useless against vehicles. In-game, it is very effective against them.
Gas Mask Mooks: Nod soldiers more resemble their Tiberian Sun-era designs so that they could be this.
Hazmat Suit: Flamethrower troopers have fireproof suits, which reduces the effectiveness of the flame thrower and laser rifles, and Chem Warriors have N/B/C suits which give them immunity to Tiberium exposure.
Heart Container: Health and Armor Expansions, which take the appearance of military award medals.
Honor Before Reason: Captain Parker disobeys orders at least twice because civilians were in trouble. His reaction to being greeted by MPs when he returns to the carrier after the first implies he pulls off things like this all the time. And he also once decided to help a defenseless city against a Nod attack instead of retreat with Dead-6.
I Work Alone: Nick "Havoc" Parker invokes this repeatedly. Even though his old team are all as competent as he is, he refuses to work with them initially. He's basically ordered to do so anyway, at which point he orders them to sit around doing nothing while he retrieves the scientists all by himself (and screws this up), and leaves them standing on the sidelines for the rest of the game.
Kill It with Fire: Lighting enemies up is by far the most effective combat strategy in the game: it stunlocks them and deals damage over time (the exception are flame troopers, but with the converse bonus that you can get more flamethrower ammo from them). Double whammy since both the flamethrower and the laser weapons (the two types of weapons which cause burning) are not bad at all.
Kill Sat: The Ion cannon. Havoc (and the GDI players in multiplayer game) can carry a one-use beacon which provides a Ion strike in the area after a 10-second delay. The penultimate mission ends with Havoc using such a beacon to trigger an ion cannon strike on the entrance of the Temple of Nod, in order to breach its wall and enter inside it.
Male Gaze: The first time you see Sakura in-game, Havoc does one of these, through a sniper scope no less.
May Contain Evil: Some locations have vending machines selling tiberium-laced soda-pop. The implication being, "anyone who wants to be a guinea pig, go right ahead."
Mêlée à Trois: The "All Brains, No Brawn" mission requires to flee a Nod research center while experiment subjects are on the loose and occasionally fight against Nod troops.
Name of Cain: Kane is heavily implied to be Cain in the series. The catacombs beneath the Temple of Nod in Egypt (during the last mission) contain a room with Abel tomb.
Nintendo Hard: The game is utterly unforgiving. Even on "Soldier" difficulty (the equivalent of "Normal") the campaign will put you up against hordes of lethally-accurate, heavily-armored enemies. Rocket troopers can one-shot you if they get a direct hit, flamethrower and chemical troops can kill you almost as quick if they get close, and of course vehicles can splatter you if they catch you in the open. What's more, the basic enemies can respawn indefinitely as long as there are officers still alive.
Even by the standards set by the rest of the game, the final level is unbelievably difficult. You can (and most likely will) die within the first ten seconds of the level unless you react immediately to the incoming enemies. Even the loading screen tip is aware of the difficulty, warning you to make liberal use of the game's quicksave feature.
No Campaign for the Wicked: Nod is only playable in multiplayer. This is the only game in the franchise where this trope applies (except for Kane's Wrath, which is indeed the exact reverse with neither GDI nor Scrin getting campaigns).
Nothing Personal: When they first meet in the game, Sakura tells Havoc she's no longer angry at him... but since she's now on Nod's payroll, she has to kill him anyway.
One-Man Army: Havoc, which is in keeping with the rest of the games, wherin the Commando units were in fact more than capable of leveling a base with little or no support.
One-Winged Angel: Raveshaw and Petrova both infuse themselves with Tiberium before confronting Havoc.
Outrun the Fireball: Havoc and Sidney running out of the Temple of Nod while the missile is exploding inside the place, during the ending cutscene.
Powered Armor: The two Mobiuses are able to wear one ("Mobius Suit"). Sidney wears it during the opening cutscene of "Evolution of Evil" (when she is captured with Havoc). Then Mobius must find it and wear it in the beginning of the next mission to escape the base. For some reason, said armor doesn't have a helmet.
Psycho for Hire: Carlos Mendoza, General Gideon Raveshaw's personal bodyguard. According to the game's lore he was too bloodthirsty even for the most "extreme extremists." He was kicked out of a Columbian separatist movement before he joined the Brotherhood of Nod. The guy laughs madly and screams threats while you fight him.
Prison Episode: Parker is captured and stripped of his weapons in "Evolution of Evil", during the opening cutscene. Escaping the Nod base is the first mission objective.
"Deadly Reunion" and "Obelisk of Oppression" are set in the same town. The former is during night and features Havoc looking for his team. The former is during the following day and features the Dead Six escaping the town.
"Evolution of Evil" and "All Brains, No Brawls" are set in the same Nod base, and respectively involve entering and fleeing it.
Sequence Breaking: In the "Armored Assault" mission, near the end, Havoc picks a green keycard lying on a terrace of the Hand of Nod, right next to the plane he must board to complete the mission. The player is then intended to reach the airstrip through the Hand of Nod corridors (crossing doors unlocked by the keycard), encounter the first boss fight of the game against Mendoza, then reach the plane. It is actually possible to jump the terrace and slide down the wall to the plane, immediately finishing the mission and skipping the boss fight.
Video Game Flamethrowers Suck: Averted. The flamethrower in this game is quite ammo efficient, fairly ubiquitous, powerful enough to even destroy tanks and light helicopters, and capable of stunlocking almost every infantry type in the game.
Walking Armory: All ten number keys are allotted a weapon. Most even have two or three guns associated with them.
What the Hell, Hero?: Killing civilians, even by accident, will result in an immediate lecture from your superiors. Oddly enough, killing Nod chefs also gets you a lecture, even though they actively attack you with flamethrowers.
Havoc: [sees Mendoza pat Sakura on the rear] Oh, you are so dead. [fires, hits a passing Mook instead] Oops.
Worthy Opponent: When traveling through Nod communication centers the player can come across holographic displays that allow communication with Nod's leader, Kane. While Kane never quite comes around to calling Havoc a worthy opponent, he does show respect for Havoc's ability to annoy him. Using the action key on the hologram may also give a database update about Kane himself, which is otherwise impossible.
You Have Failed Me: Raveshaw uses this word-for-word against Sakura when she not only fails to kill Havoc, but is taken hostage by him. He promptly orders Mendoza to shoot them both.
The player can also overhear a conversation between Kane and an incompetent Nod officer who is ordered to "report to Interrogation for 'faith restructuring'" in the second mission.