Doug's full-page color cartoon - November 1996, p. 81
caption: "Actually, that's my cellular phone, but I am glad to see you."
Overlays are common in Doug's preliminary pencil roughs; typically he xeroxes the final pencil rough and then does a color rough. Check out this first color rough and see what changes he made before going to final art.
Playboy Interview: Liam Neeson, pp. 51-58, p. 157
(blog entries by Heidi Hutson)