In the bar M. Jo puts down a bottle of champagne on the table. It's almost completely full. Luigi then picks it up, while it's still full. However, when he stands up and threatens M. Jo with it, it's empty.
At least one truck has a sign saying 'no smoking' within 50 feet of the truck, but they are smoking near the trucks all the time and even in the cabs. Mario is also smoking while the charge to explode the boulder is being set up.
Although the platform has survived two heavy trucks being driven on it, it collapses completely in splinters when one cable is broken. The hole caused in the rotten floor by the first truck seems to disappear when the second one comes.
As the nitro glycerin is a liquid how do they propose to get it to the heart of the raging fire?
Although the explosive is so volatile Bimba gets down from the truck with a whole jerrycan of it
in one hand and risks it exploding.
The goof items below may give away important plot points.
After Mario, the lone survivor, delivers the explosives, he heads back to town. He crosses the pool of oil on the road very fast, splashing oil on the workers and smearing the truck. A little later, we see a clean truck without a hint of oil or even mud on it. No car wash in between, though.