The way to verify it is to contact the pastor at your place of baptism, and ask him to look at the records to make sure they’re there. As for the change in Church sui iuris, there’s no “place” to record this on the standard pre-printed certificates, so most likely it doesn’t get recorded because of the simple fact that they don’t know where to put it.
I’ve noticed that many parish secretaries and even clerics don’t bother writing the notations on the back–yes, they are supposed to, but in my experience this is often overlooked. It’s especially overlooked that the words “no notations” or something similar is supposed to be written if there are indeed no notations (in other words, one can’t just leave it blank). I’ve had to request re-prints many many times because of this.
As for First Communion, I’ve noticed that many baptismal registers don’t contain a column for 1st Communion in the individual records–instead, they only have a section (or seperate book) to record who received and when. It’s odd because we’re supposed to notify the parish of baptism, and the parish of baptism is supposed to record it when it happens elsewhere–but there’s no column to record it in the individual records. I’ve seen this from different publishers. Odd thing that. Recording 1st Communion in the individual records is something peculiar to the US–from what I understand it’s not done in Canada or Europe.