Continuity mistake: Smithers is shown in Bart's Nightmare with green hair, instead of the grey hair he is usually seen with in the show.
Continuity mistake: Principal Skinner is shown in Bart's Nightmare with very tan skin and brown hair, instead of the yellow skin and grey hair he is usually seen with in the show.
Continuity mistake: Principal Skinner is shown in Bart's Nightmare with very tan skin and brown hair, instead of the yellow skin and grey hair he is usually seen with in the show.
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