The Wizard of Oz has been featured or referenced in...
The Former Life of Brian,
Peter's Progress,
Quagmire's Baby,
I Never Met The Dead Man,
PTV,
The Story on Page One.
There may be more but that's all I can think of. Try a web search to find the rest.
No Meals on Wheels
Mother Tucker
Model Misbehavior
PTV
Thanksgiving
The episode was : The Tan Aquatic With Steve Zissou. Season 5, episode 11
Emission Impossible & Yug Ylimaf
New Kidney in Town
Fox-y Lady
Season 4|Episode 3 Blind Ambition
Season 7|Episode 8 Family Gay
Internal Affairs S10|E23