They missed 2 opportunities to see someone entering/leaving.
If you want folk to agree they could see some of the apartment I think most will.
You will never get folk to agree they could see all of the entry/egress points to/from the apartment and that they were sat constantly watching those points without taking their eyes off the apartment because they couldn’t and they didn’t.
I’m not trying to get anyone to agree to that, as I don’t believe they could myself.
The McCann’s aren’t claiming they could see every entrance.