Oh yes, I can be extremely oblivious. Especially when it comes to what people are wearing, what a car looks like, what color the walls are, etc. For example, there have been many times when a thief came into the store I work at and we've had to call the police. The police ask me what the thief was wearing and I usually have no idea. Can't even remember if it was a t-shirt, a sweatshirt, or anything. I could tell you, however, what I thought of his character in the brief moment I got to talk to him. Or if the thief got in a car and drove away, I probably couldn't even tell you the color of the car unless it was something bright, like red or yellow or something. I could tell you if it was a car or a truck, and that's about it.
Or if I'm in a group of people and later someone asks me, "did you see that girl in the red shirt?" 99% of the time I will say no. I don't notice people at all, especially in a crowd. I think I'm too focused on what i'm doing, where I'm going, the destination, getting out of there (I hate crowds).
Even when I'm helping a customer at work, I am more focused on getting them the item they need or ringing up the purchase than I am on any details about their person. If you asked me later that day what customers came in, I could tell you every book I sold but I couldn't point out the customers in a line-up or anything.
My focus is always on what I'm doing instead of what is around me. Oh man, and don't get me started on my horrible sense of direction when I am walking. I get so lost in office buildings, shopping malls or school halls. Also, when walking around a downtown area, I never know where I am or what direction the car is in, or where I've already been. Thank god for signage with arrows.
BUT it's totally different when I'm driving. I have an excellent sense of direction when i'm driving, I never ever get lost. I think this is because, like I said, I am concentrating on what I am doing, which is driving. When I'm walking, I am not concerned with where I am walking, but more with the motion of walking. With driving, I am always planning ahead about what lane I need to get into, where I am headed, what I need to do so I don't cause an accident. I am not sure why this is so different to me than walking.... odd.