Continuity mistake: When Mac and the ambulance are running through the checkpoint at the hospital exit, when you first see the shot the stop bar is already broken off on his side of the road, in the next shot they are driving through the bar breaking it off.
The Eraser - S2-E2
MacGyver: Dreams are important, otherwise sleep is just eight hours of nothing.
Trivia: As the series wore on, Dana Elcar began going blind as a result of glaucoma. This condition was eventually written into his character, as well.
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Answer: Late one night, Geoffrey used a covert listening device to overhear David explaining his barricade device to Janet which is how he figured it out.
How do we know Geoffrey really did use a covert listening device? They didn't mention him using one.
There was a scene of him using it when David told Janet about his barricade.