On the DVD audio commentary for the episode, writer Greg Daniels cited Martin Scorsese's 1985 film After Hours as an influence on Bart's night-time trek to retrieve his soul from Milhouse, only to experience a series of unusual encounters [REF].
During an argument between Lisa and Bart, while discussing the relationship between laughter and the soul, Lisa quotes Chilean poet Pablo Neruda, and Bart responds "I am familiar with the works of Pablo Neruda."[REF]