Visible crew/equipment: In the scene where John and Matt are in the middle of an alley, with Matt using the mobile to locate the power hub, the crew can be seen from the reflection from the glass behind Matt.
Visible crew/equipment: Just as McClane jumps down the cab of the semi, there is a quick shot where the camera shadow is visible on the semi. (01:43:05)
Chosen answer: In 2005, Hurricane Katrina ravaged the city of New Orleans, with many of the residents temporarily housed in the Superdome. FEMA (Federal Emergency Management Agency) was highly criticized for their response (or lack of), including how long it took to supply the Superdome with adequate water and food. Matt's pointing out to John how the government isn't nearly as capable of responding to disaster as people think.
OneHappyHusky