Oh, all kinds of things, if dath ilan were to list out everything unusual whether or not the improbability is obviously relevant. For example, it's said that Iomedae's helmet melted during Her ascension but remained intact enough to become a major artifact, the Thorncrown of Iomedae. There's no artifacts like that said to be tied to Nethys's or Irori's ascension. This doesn't obviously tie into any other anomalies, and doesn't seem intuitively shocking given the basic premise that the Starstone ascends things that get physically close to it, and dath ilan is not actually going anywhere with this observation; but if you're trying to actually think about a puzzle you will write everything like this down in one place.
Any real scientific puzzle will contain a large number of extra pieces - and in advance of the solution, of course, you are never sure which pieces are extra.