Apparently, they were filming a holiday commercial in that mall, but you know they'd throw that stuff everywhere as soon as they could get away with it. The retailers already are.
@kismatt
Kind of reminds me of this action film that came out in the 90s with Kurt Russell and in the beginning Steven Sagal. There was a long shot of a plane landing/taking off at Andrews Airforce base in Maryland and low and behold...palm trees and S. Californian smog. Ooops.
@MariaAragon64 what cracks me up are the Christmas shows taped in LA, with the fake snow on the ground adn don't look at the palm trees in the background... lol