Visible crew/equipment: When Ana is about to leave Cora she asks her if Cora can page Dr. Dandewar, then she starts walking. As Cora starts talking you can see the boom mic move reflected in the window right beside Cora's head. (00:01:40)
![Dawn of the Dead mistake picture](/images/screenshots/98000-98999/98750_sm.jpg)
Visible crew/equipment: When Michael is about to open the door where he finds the janitor, there is a close up shot of the door handle where you see the reflection of three studio spotlights. (00:21:20)
Answer: Since it's not addressed in the script or the film, any answer would be speculation. One could be that Luis is just a generally laid back person, and the appearance of a young child he knows is not enough to ruffle his feathers, even if she isn't supposed to be there. He also just woke up, so he could be a bit groggy and not fully processing the situation as quickly as he might normally. More likely, it's simply the way the scene was filmed; the director and actor didn't think it important to show Luis "bothered" by the girl's presence (prior to noticing the blood, of course).