In Miriam's office, there is a poster on the wall with the phrase "Reach for the stars". The man depicted in the poster is the late astronomer, educator, and author Carl Sagan.
At approximately 7:04 - most of the graffiti shown are the names of the colorists who worked on the film.
At approximately 43:51 - the painting on the wall behind Aengus is a watercolor of the opening shot of the film.