The Avengers Advent Calendar

1 part comes in a colour no other set has for that mould

• Helmet with Armor Plates and Ear Protectors [Plain]White

2 parts appear in only a few other sets

• Infinity StoneTrans-Orange · ×4also in 76104 The Hulkbuster Smash-Up, 76144 Avengers Hulk Helicopter Rescue, 76209 Thor's Hammer, 76242 Thanos Mech Armor
• Infinity StoneTrans-Red · ×4also in 76107 Thanos: Ultimate Battle, 76144 Avengers Hulk Helicopter Rescue, 76209 Thor's Hammer, 76242 Thanos Mech Armor

1 mould first came out in 2021, including in this set

• Bar Holder with Clip and 90° Angle (Mechanical Leg)

1 existing mould first came out in this colour in 2021, including in this set

• Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / GrateFlat Silver · ×2

2 minifigure parts with their print are only in this set

• Torso Letterman Jacket, Buttons, Black Spider Print, Dark Turquoise Arms, Red…Bright Light Orange
• Torso Sweater, Ugly Christmas Sweater with Tree, Iron Man Helmet, Snowflake Arc…Red