Yep, once he realized you didn't have warrants out and weren't up to something, he let you go. No big deal. You were breaking the law (speeding) and he could have given you a ticket.
X2
I got pulled over 2 weeks ago driving my wife and her friend to dinner in my GXP. He claimed I did not signal when I changed lanes (I did). My wife and her friend started to say that I did and I motioned for them to be quiet. I had all my windows rolled down. He asked for my license and insurance and if I had any weapons in the car. He ran the info and asked where we were headed. I told him and actually pointed to the restaurant. He told us to have a nice night and he and I had a short chat about the local laws of carrying a gun without a CCL. I live in a part of town where most people get new cars every 3 years and they tend to drive luxury cars. My wife and I don't fit in because we don't play the luxury car payment rat race. With my window tint he couldn't clearly see who was in the car and was just checking. My wife and her friend arguing wouldn't have helped much. The officer was nice and polite. It was a bit annoying and I don't think he really was going to push the changing lanes w/o signaling. It was just an excuse to see inside since my cars don't blend in. My wife and I have both been pulled over in her Z28 for "window tint" and didn't even get a warning once they saw who we were and checked our license.
I have a friend who is a local police officer. Their biggest risk / fear is the unknown. One of those is when they can't see inside a car. Your tint may be legal, but they still have a hard time seeing what is going on. Roll all windows down and turn on your interior lights while pulling over. Keep your hands in view and don't make any sudden moves. This allows them to see what is going on and puts them at ease. This will go a long way in how they act around you because they aren't as concerned.