Here's a list of all the Halloween things that you can get, I just thought I'd post it for people's first Halloween like myself 
From Villagers walking around:
Red Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Green Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Yellow Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Purple Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Patched Hat (Lose a trick to a villager while wearing a reorderable hat)
Patched Shirt (Lose a trick to a villager while wearing a reorderable shirt)
Patched Dress (Lose a trick to a villager while wearing a reorderable dress)
Patched Pants (Lose a trick to a villager while wearing reorderable pants)
Patched Shoes (Lose a trick to a villager while wearing reorderable shoes)
Old Wall (Lose a trick to a villager while wearing a pumpkin head/patched hat with space in your inventory)
Old Floor (Lose a trick to a villager while wearing a pumpkin head/patched hat with space in your inventory)
Jack-in-the-box (Lose a trick to a villager while wearing a pumpkin head/patched hat WITHOUT any space in your inventory - replaces an item)
From Villagers indoors:
Lollipop (Scare them with a mask)
From Jack:
Creepy Statue (Give lollipop)
Creepy Stone (Give lollipop)
Creepy Bat Stone (Give lollipop)
Creepy Coffin (Give lollipop)
Creepy Cauldron (Give lollipop)
Creepy Crystal (Give lollipop)
Creepy Clock (Give lollipop)
Creepy Skeleton (Give lollipop)
Creepy Wall (Give lollipop)
Creepy Floor (Give lollipop)
Pumpkin Head (Tell him you don't have any candy while not wearing a hat/ accessory)
From Villagers walking around:
Red Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Green Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Yellow Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Purple Pumpkin Head (Lose a trick without a hat on to a villager wearing this)
Patched Hat (Lose a trick to a villager while wearing a reorderable hat)
Patched Shirt (Lose a trick to a villager while wearing a reorderable shirt)
Patched Dress (Lose a trick to a villager while wearing a reorderable dress)
Patched Pants (Lose a trick to a villager while wearing reorderable pants)
Patched Shoes (Lose a trick to a villager while wearing reorderable shoes)
Old Wall (Lose a trick to a villager while wearing a pumpkin head/patched hat with space in your inventory)
Old Floor (Lose a trick to a villager while wearing a pumpkin head/patched hat with space in your inventory)
Jack-in-the-box (Lose a trick to a villager while wearing a pumpkin head/patched hat WITHOUT any space in your inventory - replaces an item)
From Villagers indoors:
Lollipop (Scare them with a mask)
From Jack:
Creepy Statue (Give lollipop)
Creepy Stone (Give lollipop)
Creepy Bat Stone (Give lollipop)
Creepy Coffin (Give lollipop)
Creepy Cauldron (Give lollipop)
Creepy Crystal (Give lollipop)
Creepy Clock (Give lollipop)
Creepy Skeleton (Give lollipop)
Creepy Wall (Give lollipop)
Creepy Floor (Give lollipop)
Pumpkin Head (Tell him you don't have any candy while not wearing a hat/ accessory)
