What is the name of a 45-minute-long crossover episode dedicated in memory of Louis Castellaneta?
Clown in the Dumps:  This episode was dedicated in memory of Louis Castellaneta, the father of "The Simpsons" voice actor Dan Castellaneta. The Simpsons Guy:  "The Simpsons Guy" is a 45-minute-long crossover with "The Simpsons", and was written by Patrick Meighan and directed by Peter Shin.
The Simpsons Guy