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Three examples is all you need and "this is about a Product Placement or tie-in that is so minor to the work it's in that you don't recall the Product Placement in the main work — you only know about the connection from the advertising for the product." is very straightforward a description.
I seen this quite a bit, mostly as parody of this, which means those examples also count. But can I remember one now to write as an example? no. Next time I see it, I'll write it down (pen and paper - you can limit your time on TV Tropes like that!) and add it.
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How well does it match the trope?