Question regarding an older Datejust

[(DMB)]

I recently purchased a datejust dating to around 1982. It has the cal 3035 movement and the ref number is 16030 with the acrylic crystal, SS bezel, quickset date.The seller is reputable, and I have all the service papers from a 2007 full service done by Rolex. Here is the scenario:

Over the weekend I starting swapping watches all day long like all of us watch nerds do. I usually set everything and at least hack it to one of my others that is running. I wore the watch sporadically over the weekend, and wound up wearing it to work today. About mid morning I noticed the date was a day or two behind. Now, I could have forgotten to set the date when I was messing with it over the weekend. Anyhow, when I set it at work to the correct date, I noticed that not only was it off, but in the wrong AM/PM configuration. Anyhow, I manually advanced the hands several days making sure it snapped over at midnight (which it did .. on the spot). When I was convinced that everything was working as it should, I set the time (10:30 AM) then began quicksetting the date. I had manually advanced it earlier to several days past the correct date, so I basically had to go around the horn with it. Everthing worked fine, until I got to the 28th where it hung up halfway. I had to push the crown in, and pull it back out to the first position, then it clicked over when I began turning it again. It did it again on either the 29th or 30th. I repeated everything and set it to today's date.

Given this long, drawn out scenario ... my question is this: Can a date wheel get messed up only in a certain spot? If so, that could explain why it still showed a date from this weekend. I hadn't worn the watch since the 20th or so, so it seems if I forgot to set the date it would have shown farther back than the 29th, which is what I think it was showing when I noticed it this morning. Thanks, I know this was long.