Word for something that stands out

Those are just three things that stood out to me.

In regard to the answer above, if you alter your sentence then you could use a noun. For example.

There were just three things that drew my attention

or

There were just three things that immediately drew my attention

attention noun [ U ] UK /əˈten.ʃən/ US /əˈten.ʃən/ attention noun [U] NOTICE, thought, or interest:

It seems to me eminences and prominences are the only nouns for things that stand out and are positive, but they'd both stick out like HotLicks's sore thumbs. Perhaps we've never felt the need to name such things with a single word.

"Three things that stood out" is perfectly plain English. You could say they became clear or were apparent, or call them noticeable things or prominent features, or choose your adjective from Lexico's noticeable, perceptible, discernible, detectable, distinguishable, observable, perceivable, visible, easily seen, appreciable, recognizable, notable, distinct, evident, obvious, apparent, manifest, patent, plain, clear, clear-cut, marked, significant, conspicuous, unmistakable, undeniable, palpable, pronounced, decided, prominent, salient, striking and arresting, but "three things that stood out" is fine in any context.