MacGyver (1985)
0 mistakes in season 7 - chronological order
Starring: Dana Elcar, Richard Dean Anderson
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The Eraser - S2-E2
MacGyver: Look, if this works, it'll keep us from gettin' caught. If it doesn't, it'll keep us from gettin' old.
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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.