This is a list of hidden things shown in a cards icon.
Ghost Sludger: If You Look Closely, he has a mace instead of a hammer, what the normal Sludger has.
Corn Lord: When summoned, you can hear it fart briefly.
Improved Sugar Imp: Look Closely, He Is Holding A Sugar Cube.
Black Cat: Has green eyes and wears a wizard hat.
Record Thug: He is holding a toothbrush, and you can also see other records behind him.
Soft Eyeling/Red Eyeling/Polterclops: Have mouths.
Rainbow Barfer/Pea Soup Barfer: Have legs.
Woad Blood: Has shark teeth on it.
Diamond Dan: Has a slingshot.
Infinite Figure:Has a rake.
Sand Jackal: Seems to have spread sand in its surroundings.
Haunted Windmill: Has ghost slime on it.
Peach Djini: Has a juice box.
Good King Wonderful: Has a crown resembling the Ice King's.
Sand Angel: Has a tiny sand castle above its head.