An homage would require frank acknowledgement. Even as simple as “Special thanks to Daniel Clowes” and then put that in a title card (he can now even cut and paste it from this post!).
Lifting direct text is not an homage. It is plagiarism and lazy filmmaking, both of which are frowned upon in a world that has better people wiling to do more for less at every step of the way. He’ll be self-financing his own work for a very long time as a result of these actions.
