1. He pretended like he didn't see me. This is used by native speakers in casual conversation, but the use of "like" here is very "low register." He pretended that he didn't see me. (He acted as if he didn't see me.)
2. This bus is going over the flyover. This is natural.
I was aware of your request, but couldn't think of another way to say it. I'm sure someone else can. I can only give "reasons" why the face might be unrecognizable. In the photograph, you seemed to be in great pain. Perhaps that's why he could not recognize your face.