Plot hole: When Bond and Tibbett break into the underground lab and find the device which drugs the racehorses, you can see that it has a large light emitting diode (LED) on the top of it. What possible use would that be, since the device is implanted in the horse's leg, and is supposed to be covert? (00:37:20)
Plot hole: After sneaking into Zorin's secret laboratory, why did Bond and Tibbett decide to spend another day there? They would have known that the two guards they fought would inform Zorin they were spies and blow their cover. Besides, they already knew how Zorin was winning the races, so staying another day was just suicide. (00:39:40)
Chosen answer: The Mythbusters tested that very thing on their show. The result was that it was impossible to breathe in air from a leaking tire while underwater.
raywest ★