From Newsgroup: alt.tv.simpsons
The Burns Cage
Artwork at Mr. Burns' office:
Picture of Burns looking like Putin
"Nude Descending A Staircase" with Mr. Burns. 
https://en.wikipedia.org/wiki/Nude_Descending_a_Staircase,_No._2
"Liberty Leading the People" with Mr. Burns. 
https://en.wikipedia.org/wiki/Liberty_Leading_the_People
"The Grand Odalisque" with Mr. Burns.
https://en.wikipedia.org/wiki/Grande_Odalisque
I assume the next one is "The Luncheon on the Grass" with Burns and Smithers. 
https://en.wikipedia.org/wiki/Le_D%C3%A9jeuner_sur_l%E2%80%99herb
The last painting and the sculpture are too highbrow for me to recognize.
The bit with Burns looking out the window through the blinds reminded me of  Blofeld at the secret base in the volcano in "You Only Live Twice"
Mr. Largo was getting a marriage license.  Or a fishing license.  We cannot  tell.
According to the "Come with me to Habana" map, Springfield is somewhere in  Missouri?
Mr. Burns' face resembles the face of the "Buzzard of Death".  Whatever that  is.
"Treasure of the Sierra Madre" and "The African Queen" have references near the 
end of the episode.  The new student was Bogart, Willie was Walter Huston, and  Moe must have been Tim Holt.
Mr. Museum
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