Fitzcarraldo referenced in The Simpsons
Saw this episode in the simpsons last night, the episode is "On a Clear Day I Can't See My Sister" and in it the schoolchildren are forced to tow their bus up an icy road, and Üter exclaims "I feel like I'm in Fitzcarraldo." Nelson replies "That movie was flawed!", punching Üter in the stomach.
What does he mean by flawed?