Henry Rothwell has an epically long, epically snarky review of Prometheus, entertainingly and engagingly written. Its fundamental point is that science fiction films are visually consistent, not logically consistent (the opposite of science fiction novels, which is why I'm a pain in the ass to take to sf movies). Rothwell gets there by pretty humorous means.
The first duty of the captain is, naturally, to decorate the Christmas tree. Because it's Christmas apparently. Charlize Theron reminds him that there is a mission briefing. He informs her that he has yet to have breakfast. He's been asleep for two years, and decides to decorate a Christmas tree (while smoking a cigar in a closed environment) before he has breakfast. We realise that the crew selection procedure was yet another casualty of the cuts required to ensure that they had a sodding big spaceship (SBS from here on in).
At the breakfast table a rather nice biologist (played by Raef Spall, son of Timothy) introduces himself to a grumpy geologist, who is very rude. Later on, he confirms he's the geologist, by shouting "I'm a geologist, I fucking love rocks!" as if that was the most pressing point that needed explaining. But we're getting ahead of ourselves. The current point that needs explaining is the implication that these two crew members have managed to make it this far without actually meeting each other, and are plainly incompatible. It seems that at least one part of the crew selection procedure took the form of a raffle at an arsehole convention.