1) So....what was the point of killing the Captain at the start? It seemed to serve utterly no purpose. They could easily have had nobody killed in a freak accident and still decided to go check out the planet. All they needed was someone outside making repairs to get the signal.
They seemed to be trying to set up tension between the new captain and the crew, then beyond the crew holding a funeral against his orders there was absolutely no follow-up to it.
2) Speaking of the new Captain, he seemed fine at first then turned into a complete idiot by following David down to the Egg chamber. Given what he had just seen upstairs in David's lab, combined with what happened to the other crew members earlier, then he should have just noped right the fuck out of there immediately. Even without knowing what's coming why the hell would you go anywhere near one of those things when the creepy synthetic dude has just told you that he made them from the stuff that caused a monster to burst out of one of your crew members mouths?
3) Also, on the subject of the arm raising chestbuster....why did it even have legs? Chestbursters don't have legs. Or is this still supposed to be an 'earlier' version before David completed work on them?