At around1:25, Fred starts up the stairs carrying only a pistol. In the next cut a few steps further up, he blasts a bad guy with an automatic rifle that materialized by magic... or sloppy editing.
Tracy drops her large bag of equipment on the hallway floor while using a device to unlock the control room. She then enters without picking it up, but none of the bad guys see it when they enter that corridor.
When Malone is at the reception at the hotel boom mic is clearly visible for a few seconds, slowly descending from the top of the screen.