Now I assume everything is marketing by default. A couple that come to mind:
the ugly sonic design when the movie came out. You get a whole wave of promotion from the outrage, then another when the design is fixed.
An innocuous "my girlfriend's shirt matched her coffee mug" post but there are some brand name cookies in the edge of the frame.
If I worked in marketing, these are the sorts of things I'd be trying to come up with. It gets even more fun when you apply these concepts to political propaganda.