Any of these and more "count"

...over the rainbow
somewhere over the rainbow ..the words spoken or the music played
munchkin ..such as a small person referred to as a munchkin ...used often in sports analogies
and your little dog too
and to-to too ?
we're not in kansas anymore 
auntie em
tin man / cowardly lion / scarecrow used in context of someone without a brain
the recognizable music for miss gulch (when she is on the bike)
wicked witch
are you a good witch or a bad witch
horse of a different color
no place like home
red slippers / ruby slippers
the witch is dead ...or even an hanging "ding dong" is a reference in certain contexts
come out come out wherever you are
the lollipop guild / the lullabye league
"when life drops a house on you" reference
any green faced witch
I'm melting
my preeeetttttyyyyy
emerald city
it's always best to start at the beginning
people come and go so quickly here
If I only had a brain / a heart / some nerve
Lions and Tigers and Bears
...and what would you do with a  brain if you had one?
because of the wonderful things he does
paaaaahhhhpies  (poppies)
Surrender Dorothy   (or surrender __ written in the sky in that context)
well bust my buttons
man behind the curtain
a place like oz/ land of oz /
I am the great and powerful oz
Witch Theme "the old one"
most references to flying monkeys
many judy garland references in context
When someone says something like "that's like having a house dropped on you"

Anytime someone describes someone as the Wizard of _____ like a meterolgist as the Wizard of Weather or a player described as the Wizard of Dunk etc. 

Wizards of Waverly Place perhaps

references to spin off movies such as "the wiz" or the miniseries "tin man" or the musical "wicked"


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IMDB Page for Wizard OF Oz

IMDB CONNECTIONS PAGE

From Cracked.com   Why the Wicked Witch had a reason to terrorize Dorothy

The "villain":

You're in a tough spot if "Wicked" is right there in your name, but WWW isn't exactly the most image conscious celebrity in Oz, either: She kidnapped Dorothy, threatened to drown her dog and tried to set The Scarecrow on fire, all to get her hands on the girl's ruby slippers. Foot fetish or not, that was some stone-cold villainy.

Nice teeth, though.

Hold on a minute there:

Remember that the Witch wasn't after Dorothy, and she wasn't trying to rule the world. All she ever wanted was those slippers. Say, how did Dorothy acquire those magical shoes in the first place? Why, by taking them off the blood-drenched feet of the Wicked Witch of the East. Who she just murdered. Who also happened to be the Wicked Witch of the West's sister.

These shoes used to be white...

Let's look at the whole "accident" from the West Witch's perspective:

The Witch sisters are hanging around Oz, minding their own business when some random teenager crushes a woman to death with a house, killing her instantly in an act of domiciliary manslaughter. Next, the teenager waltzes out and corpse-loots the victim's shoes (some sort of creepy kill-trophy, no doubt) which under every inheritance law in the universe damn well belong to the deceased's surviving family.

From where we stand, the Wicked Witch of the West had every right in the world to bludgeon Dorothy to death with a sock full of toxic batteries, but what did she do? Absolutely nothing. She just wanted her shoes back, and every action that she took was motivated by that want. Then, of course, Dorothy raises an army in the form of a giant, talking lion, a man made of metal and an unkillable scarecrow, steals the Witch's broomstick and kills the Witch, staging a nice little Witch sister reunion in the afterlife.

Never forget.