(at around 53 mins) When Matt and Morton are taping flash lights to their guns, Morton clearly struggles with the tape and never actually gets a piece off with his fingers to attach the flashlight; however, in the next scene, he emerges from the building with flashlight clearly taped.
(at around 1h 19 mins) Towards the end of the film, a brick of C4 explodes when it is shot. C4 does not detonate when shot.
(at around 11 mins) Scaffolding visible in background after Matt falls in the pit.
The female archaeologist arrives at the dig/construction area in a tight skirt, heeled dress boots and no hardhat. There are rules about proper safety clothing on an active site, especially one involving blasting, working underground and previous cave ins like the one the male archaeologist just fell in, leading to her being called in to oversee safety, which she clearly doesn't know about.