In the scene where the cop cars converge on the mall,watch the cop from the car close to the camera. His hat is starting to tilt as he emerges from the car and as he runs it completely comes off his head with what seems to be a white "headband" inside that falls away from the hat and both of these are ignored by that cop and the succeeding ones.
Brandi tells T.S. that the female contestant for her dad's show had an embolism pop in her head in mid backstroke. Embolisms occurs when an object (usually a clot) migrates from one part of the body (through circulation) and causes a blockage (occlusion) of a blood vessel in another part of the body. There is no popping involved. Brandi is apparently confusing an embolism with an aneurysm (a localized, blood-filled dilation (balloon-like bulge) of a blood vessel caused by disease or weakening of the vessel wall).