For those few who don't get the joke, it'll be much more obvious once you've seen this:
Oh my God, the attention to detail!
- The box of Champion Lamps in the closet
- The map of England, the globe and the movie screen in the corner
- The picture of Walt Whitman above the chalkboard (though it's a different picture)
- The chalkboard at the back of the room
- The colors of and the logo on the school jackets
- The design of the classroom door
- The NUMBER on the classroom door (it's a 10)
- The background music when the boys stand on their desks
O, Captain! My Captain! I sing my song for all to hear.