When Barrios falls off the motorbike he lands on the edge of the road but in the next shot he is on the soil, crawling towards the road.
The amount and size of bullet holes/dents in the piece of steel that is covering the back of the car Jack is driving (being shot at by the pursuing North Koreans) changes. By the time they make it to the border, there are a lot few holes/dents then were seen during the chase.
A bullet hole is shot into the driver's door of the car after Jack drives through the hospital wall to rescue MacGyver and Sarah. After he backs out of the hospital, the bullet hole is gone.
Jack states that Mac's father left when he was 12. In Flashlight Bozer tells Riley that Mac was told about his father leaving on his 10th birthday.
MacGyver ignites a fire on wooden crates from across a 50 meter clearing with a 3 cm magnifying lens. This would not occur; the supposed focus of the lens on the wood crates is shown to be the same size, so the solar energy is not concentrated at all.
There was more solar energy on the crates naturally than what Mac was redirecting onto it.
There was more solar energy on the crates naturally than what Mac was redirecting onto it.
Upon revealing Amy Acker as the spy in question, they show her stats sheet that states she's 5 years younger, 2 inches shorter, and 30 pounds heavier the actress really is. The weight is a big stretch, the other two are at least believable.
MacGyver finds his ex-girlfriend's passport hidden behind an electric outlet in his house. After he removes the outlet cover, the point-of-view from inside the wall shows his entire face looking into the wall. The outlet hole would only be about 3" x 5", hardly enough to see as much of his face as pictured.
MacGyver wouldn't have known Nikki Carpenter at this younger age. He met her whilst investigating her fathers death.