The movie the picture below resembles in its entirety (ths poster on the right side of the picture and the human body chart on the left side)

is Lean On Me, which starred Morgan Freeman as Joe Clark, a tough disciplinarian hired to run Eastside High, the worst school in Paterson, New Jersey. The poster "Eastside Pride Can Never Be Denied" comes from one scene in the movie, the chart comes from another.
At the start of the episode, Tweek Bros. is three doors to the right of Tom's Rhinoplasty. When Mr. Tweek asks his son how the oral report went, Tweek Bros. is across the street from Tom's Rhinoplasty. The exterior walls are also a darker brown than before, but the original color quickly returns.
On the flag the star design is wrong, and there's a star missing on the second row from the bottom.
At one point, the Lady Protester has a sign that says
| NO Corperate Coffee |
|---|
The Harbucks logo design changes constantly.
A Prop. 10 supporter has a sign that says
| I SI |
|---|
| PARA |
| PROP 10 |
The scene depicted in the Gnomes' underpants mining operation comes from this short:
| WB782: | Yankee Dood It 19561013, Merrie Melodies |
| Characters: | Sylvester, Elmer Fudd |
| Director: | Fritz Freleng |
| Writer: | Warren Foster |
| Animators: | Gerry Chiniquy; Virgil Ross; Arthur Davis |
| Background: | Hawley Pratt; Irv Wyner |
| Music: | Milt Franklyn; features some of Raymond Scott's "Powerhouse" |
| Note: | Contains educational section on business development and the economy. |
| ID # | WB5624 |
| Synopsis: | Elmer Fudd is the progressive King of industrial Elves. He visits an outmoded shoemaker's shop to extol the virtues of mass production capitalism to the shoemaker, whose pet cat, Sylvester, uses the magic word, "Jehosophat" to turn Fudd's elf helper into a mouse and chases him around the shoemaker's shop. |