I got a look much like that when I was staying at Brad's. I left the house in the morning through the garage and crossed over to the other side of the street where reception is better for some reason, then looked back at the house and fumbled with my phone a bit to close the door. A guy who was waiting by a car on the sidewalk looked like he was about to ask about it but then he got into his car and drove away.

The weird thing is that it seems that phone-controlled doors aren't that unusual. The apartment block I'm in right now has a phone-accessible door control that I can in theory call and press 9 to open the door, though they use caller-id as the access control and I've not told them my number so I've not tried it out. I think the intended way to use it is for the door to call you and you to let other people in, but according to the instructions it works both ways.