Immigration encounters

The first few years of overseas travel was a breeze and I have not had any real negative run-ins with immigration authorities until last saturday. Here's what I've had to deal with so far (the memorable ones):
1. Travelling from bangkok to phuket my last name was misspelled by my friend in the plane booking. This doesn't really qualify as immigration authorities are not involved. Nonetheless, it gave me a scare lest I be left alone in bangkok while all of my friends go island hopping in phuket. Because the difference was very minor, I hopped to phuket without problems.
2. Getting to the US with my visa , the homeland security had to see the rest of our supporting papers due to the 'mismatch' between the blanket petition in the visa and the company mentioned in our invite letter. We had to make a dash through the Minneapolis airport to make it to our connecting flight. Our check-in baggage didn't make it and we had to wait until the next day. Yes, do bring an extra set of clothes in your handcarry. I don't consider this negative, just memorable.
3. During the hk trip with my mom last February, hk immigration authorities had to ask me especially my mom several questions regarding the purpose of our visit. It was a good thing that we didn't book a hostel and have a bit of an itinerary in mind though we didn't really make any arrangements. It was her third time and my second but her passport was just renewed and was thus empty. Our conclusion was that she got considered as a candidate for someone that could be an illegal DH. Maybe she should bring her old passport with her. The hotel booking probably saved us and maybe the itinerary.
4. On my recent business trip to copi-suban, I didn't make the distinction between business and work. Good thing God was there with me and they let me pass with my fumble. I didn't realize you had to be specific. I thought they were one and the same and should do.
5. I looked different probably older as the one in my passport that the officer felt or was compelled to verify my identity. This was on the trip home yesterday. She called me by first name and I thought I heard 'Rowena'. My first thought was did I give her the wrong passport? Of course, that couldn't possibly be the case until I realized she was calling out my actual first name. You see, I am not used to people calling me by that and it's something I rarely use and more often than not only on paper. Took me a few seconds to realize and say 'first name' but the officer let me through.
6. And the most memorable and the only real negative one goes to our own immigration authorities. It's my first time to travel with officemates for pleasure and when asked what our relation to each other us, instead of saying friends we said officemates. Both should have been true but maybe just maybe if we said the former instead of the latter, it saved us some time and BV. After saying officemates, she asked us what we were going to do in hk and then looked for our company id. Can somebody please explain to us, why we should be carrying this around when: a) we don't have an office there, b) it is not considered a valid id, c) we were not travelling because of work but holiday/vacation? Luckily for me, I had mine with me but this only caused her to lash out some more on my friends for not bringing theirs. I said lucky because if I did not cram packing I probably would have also left it at home. The driver's license didn't cut it for her and she gave herself as an example that she always carries hers around. Yes, she was technically working at that time and needed to wear hers. Out came the health card and the valid US visa (which had the name of our company) but she could not be convinced. Our passports have multiple visas on them and several stamps but that apparently didn't help our case. I was waiting for her to ask for our itinerary/hotel bookings but she didn't ask for them. She was too mad at us for not bringing and showing her our company id. I can't really explain her behavior aside from being some form of power trip or making us cringe in case we were hiding something. We didn't really argue that much to avoid aggravating our situation... She was signalling to her colleagues and deep down I was getting scared that they will escort us out. I was considering name dropping if the situation got worse and contacted my dad for back-up. Good thing we didn't have to resort to that and just absorbed her stress and her madness. Whew! And I thought you'd have less problems the more stamps and visas you have...