The episode's tension builds as Homer's family and friends begin to suspect that Ray is merely a figment of his imagination. Key "clues" planted by the writers include:
Lisa discovers that "Ray Magini" is an anagram for "imaginary".
"The Simpsons" Don't Fear the Roofer (TV Episode 2005) - IMDb
For more detailed trivia and reviews, you can check the episode's IMDb page or its overview on the Simpsons Wiki .
The episode's tension builds as Homer's family and friends begin to suspect that Ray is merely a figment of his imagination. Key "clues" planted by the writers include: