Surely the Antarctic pyramid idea did't help save budget?
A space station or some outpost on a frontier planet would not have cost more to realise?
Other than the dagger, spear and shuriken being immune to acid (while the chest armor, wristblades and razor net melt like butter)...which raises the question: if you're going to use a non-acid-resistant net against xenomorphs, why would you make it capable of cutting into xenomorph carapace?
...but other than all the above, the biggest logical anomaly was that in the final film, Scar, Celtic and Chopper were supposed to obtain their high-powered shoulder-cannons before their hunt started, no? Where is the challenge in that. You could argue items of gear that melted easily to acid provided the challenge...but if all three Initiates can just triple-blast their way through the pyramid, this is a strangely conceived Rite of Passage/Manhood Ritual.