Employment Based Greencard

I went to interview today, the officer just asked some basic questions. While asking, he checked a document, maybe to verify whether it matches or not, it was straightforward, no any serious question. An the end, I have signed that checked document, only last page, I have noticed 1 note said something about "there are 4 changes", same with my wife, but she has 3 changes. We forgot asking what were changes, also did not ask for status. He said we will receive a notice in 90 days or ealier.
PS: He only took Employment letter and pay stubs, nothing else.

I'm not sure it is normal case or worse..., does anyone have same experience