When Linda asks the paramedic to give them a minute the ambulance behind her disappears. This can be seen more clearly moments later when the camera switches back to a wide angle.
After Toby mentions benzodiazepines, Cabe says that they are "a government issued chemical developed a few years ago for enhanced interrogation". In fact benzodiazepines are a group of substances that includes well known anxiety medications, like Klonopin, Valium and Xanax, the later mentioned by Toby himself in a previous episode.