Fence + Suitcase + Americium-241 - S3-E12
Revealing mistake: When MacGyver cuts the green wire under the bomb, the wire is not tied up at both ends. (00:25:45)
Factual error: A Marine Corps general is visiting Project Phoenix. His ribbons are mostly not USMC authorized and those that are are pretty much out of order. Second, his four star insignias on the collar are way too high. They should be midway on the collar. (00:03:55)