Journeyman: Goof or ad?

In episode 5 of Journeyman, a modern Jack In The Box billboard appears in the 1970s when Dan meets the Cambodian for the first time, advertising their sirloin burgers. The billboard appears briefly as they start the scene at the gas station - it appears near the upper left corner of the screen just above the roof of the gas station. Goof or ad? I'm going to guess ad.