From Ain’t It Cool News, an amusing bit from Q&A; with Joss Whedon at the L. A. Comic Book and Science Fiction Convention:

When someone mentioned that both Whedon and Edlund had worked on the “Titan A.E.” script, Whedon groaned and remembered that, on the way home from the “Titan” screening, his wife told him to “say something funny so I’ll remember that you are.”

Whedon had to be the one who put in the line about naming the planet “Bob.”