I actually like the commercial. It's just that the choice of Dunkin Donuts, used as an example to emphasize a point in a nationally televised Sprint commercial, that is interesting .
While Dunkin Donuts is well known in various parts of the county, the chain is only in 34 of the 50 states (68%). The region where I live happens to be one of the areas without them.
I asked some people who I saw the commercial with whether they "got" the Dunkin Donuts reference. It did not mean much to any of them -- though several had heard of the donut chain.
Does it hurt the advertisement? I do not know. But such a brand non-recognition or attachment to a "hook" in your commercial sure can't help.