One of the dependencies that, when found in the summary but not in the article, indicates a possible error is the "amod" (adjectival modifier) dependency.
Applied to this summary, we have "First" as the entity, and it is the adjectival modifier of the word "phone".
And indeed, this unmatched dependency indicates an actual error here. The sentence is not factual, since the article talks about a **new** type of flagship phone,
and not the **first** flagship phone. This error was found by filtering on this specific kind of dependency. Empirical results showed that unmatched *amod* dependencies often suggest
that the summary sentence contains an error.  <br> <br>
Another dependency that we use is the "pobj" (object of preposition) dependency.
Furthermore, we only match *pobj* dependencies when the target word is "in", as in this example.
In this case the sentence itself contains a factual error (because the article states "there's no word on a US release date yet").
However, this could have been found by entity matching already (as january 18 is unmatched), and the unmatched dependency can not be completely blamed for this error here.