Kid + Plane + Cable + Truck - S4-E3
Factual error: A US Pilot's License is shown. It is pretty much all wrong. Salient among the errors is that US Pilot's Licenses do not have a picture. The nationality should be USA not America. They are green fading to white, and not blue. It does not have a hologram of the FAA seal. The signature on the front is that of the pilot and not the FAA Administrator. I realise that it would be improper to show an actual license on a TV show, but this is so far off as to be ludicrous. (00:02:20)
Windmill + Acetone + Celluloid + Firing Pin - S4-E4
Factual error: While the collapsed building is described by Matty to be located in Karlsruhe, it's actually in Heidelberg (as seen by the famous castle on the left and the river Neckar with its bridges). (00:05:15)
Father + Son + Father + Matriarch - S4-E8
Factual error: Mac and Desi have been invited to a "pop-up" restaurant. There aren't many limitations on pop-up restaurants when it comes to choosing a location. You could host a pop-up in another restaurant's kitchen during off hours. Or you could set up shop on a city rooftop, at an apartment complex, or in an unconventional space. What is NOT a location is a place with swanky double entrance doors with the name of the pop-up restaurant in custom etched or frosted glass on them. Really? (00:06:10)