The snakes in both torture scenes are South American red-tailed boa constrictors. They are not poisonous and rarely strike humans.
The way Irisa is holding that knife and sharpening stone, she would make it blunter, not sharper. As someone who relies so heavily on her blades, she should know something that obvious.
When Eddie is pointing the gun at Nolan, its barrel is very clearly plugged.
When the ERep convoy is pulling up, it's following very noticeable tyre tracks from previous takes.
When Nolan brings the suitcase to Preston to "negotiate," Preston threatens Nolan by saying: "Trust not in a friend. Put not your confidence in a companion. Micah 5:7." This quote is not Micah 5:7, but rather, Micah 7:5.