Very normal! And it sounds as if it went fine. IMO it is a good thing they looked you up - it's probably a sign of interest.
My first lecture was just after I finished my PhD, and intimidatingly it was in the exact lecture room where I had heard my first undergraduate lecture a decade before. I had prepared a careful powerpoint with lots of images and had organised handouts for the number of students I was told to expect.
On the day, the powerpoint resolutely refused to work, and I discovered there was no tech support whatsoever (though a very nice bloke did try to help me sort it before telling me he'd asked around and all the tech in the building was known to be unusable and needed updating - a fact no one had mentioned before).
So, five minutes late starting, I had to wing the whole thing without my images, and to make it worse there were roughly three times as many students as there should have been (no compliment to me - the person who told me the number simply fucked up), so they were sharing handouts one between three.
Despite that, I survived! 
I even got perfectly decent evaluations for the course overall, which shows me that students are quite capable of being fair and compassionate, and they realised the tech issues were not my fault.
Good luck with the next one!