The Old Man and the Lisa/References

Continuity

 * When, Mr. Burns goes to the Simpsons' house, asking Homer for his daughter, Homer suggests he means Maggie. Mr. Burns mumbles "The baby who shot me", while Maggie makes a pistol gesture, a reference to "Who Shot Mr. Burns? (Part Two)".
 * A drum of Lil' Lisa Slurry can be seen in the water in "Bart Carny".
 * Kent Brockman mentions Mr. Burns as the man who blocked out the sun ("Who Shot Mr. Burns? (Part One)") and who ran over a local boy ("Bart Gets Hit by a Car").
 * Some of the kids in the recycling group are Lisa's friends from "Summer of 4 Ft. 2".

Cultural references

 * The title is a reference to The Old Man and the Sea.
 * Mr. Burns tells a hippie to "shine on your crazy diamond", referring to the song by Pink Floyd of the same name.
 * Lisa recycling episode is a parody of the ending of  as Lisa begs people not to recycle to stop the slurry.

Trivia

 * Mr. Burns' scowl is not seen in part of the episode.