The Chamber of Secrets

3 moulds appear in no other set

• Animal Body Part, Snake / Serpent Head, Basilisk with Dark Green, Dark Tan, and…
• Animal Body Part, Snake / Serpent Neck S-Curve with Fixed Pin with Scales Print…
• Creature, Phoenix (Fawkes)

3 parts come in a colour no other set has for that mould

• Weapon Dagger / KnifeGlow In Dark Opaque · ×2
• Hips and Sand Red LegsSand Red
• Neckwear Cape, Standard [Traditional Starched Fabric]Sand Red

2 printed parts are only in this set

• Brick 1 x 6 x 5 with Stone and Open Mouth Snake PrintLight Gray · ×4
• Animal Body Part, Snake / Serpent Body, Basilisk with Scales PrintSand Green · ×2

17 parts appear in only a few other sets

• Animal Body Part, Alligator / Crocodile / Dragon Upper Jaw / Dinosaur TongueDark Gray · ×4also in 5988 The Temple of Anubis
• Book 2 x 3 with Lock and Soiled Spots PrintBrownalso in 4731 Dobby's Release (all Harry Potter)
• Brick 8 x 16Blackalso in 6969 Celestial Stinger / Space Swarm
• Brick Sloped 65° 2 x 2 x 2 Smooth without Bottom TubeLight Grayalso in 3310 Press Box
• Hair Center PartingEarth Orangealso in HPG03 Harry Potter Minifigure Collection Gallery 3 (all Harry Potter)
• Brick 12 x 24Black · ×2also in 10144 Sandcrawler, 8781 The Castle of Morcia
• Hair WavyTanalso in 4733 The Dueling Club, HPG01 Harry Potter Minifigure Collection Gallery 1 (all Harry Potter)
• Hinge Brick 1 x 4 [Upper]Dark Gray · ×4also in 3451 Sopwith Camel, 4729 Dumbledore's Office, 10027 Train Engine Shed
• Animal / Creature Body Part, Tail / Neck, Base Section with Black PinSand Greenalso in 6719 Brachiosaurus, 4501-2, 4501 Mos Eisley Cantina
• Animal, Bird, Owl Large, Rounded FeaturesLight Grayalso in 4723 Diagon Alley Shops, 5838 The Wicked Madam Frost, 5850 The Royal Crystal Palace
• Hinge Brick 1 x 4 [Lower]Dark Gray · ×4also in 3451 Sopwith Camel, 4729 Dumbledore's Office, 10027 Train Engine Shed, 1381 Vampire's Crypt
• Panel 3 x 4 x 6 with Arched WindowDark Gray · ×4also in 6091 King Leo's Castle, 6026 King Leo, 4817 Dungeon, 6098 King Leo's Castle
• and 5 more

1 part is otherwise only found in Harry Potter sets

• Hair Short Bowl CutEarth Orange

2 moulds first came out in 2002, including in this set

• Animal Body Part, Snake / Serpent Body, Basilisk with Scales Print×2
• Hair Wavy

4 existing moulds first came out in their colour in 2002, including in this set

• Brick 1 x 1 x 5 with Blocked Open or Hollow StudDark Gray · ×2
• Brick 12 x 24Black · ×2
• Bar 4L (Lightsaber Blade / Wand)Dark Nougat
• Hair Center PartingEarth Orange

2 minifigure parts with their print are only in this set

• Shield Ovoid with Open Mouth Snake PrintLight Gray · ×2
• Torso Jacket, Open over Tan Vest Print (Gilderoy Lockhart), Sand Red Arms…Sand Red