Continuity mistake: When the green snake slithers towards the boy, Todd throws a boot at the boys feet so the boy can hit the snake with it. The boy looks at Todd who motions the boy to hit it. The next shot shows the boys feet again, but no boot.
Continuity mistake: When Todd first encounters the humans on the waste disposal planet he falls down some stairs. He coughs up blood which is visible on his hand and on the ground. It cuts away from Todd and when it cuts back there is no blood at all.
Revealing mistake: When Todd is hitting the metal punchbag the first time, during the slow mo part you can see it flex as if it is made of rubber.
Character mistake: After killing three of the 'new' soldiers, Todd says that there are seventeen left. He then kills about another thirty.
Church: My daddy always said, "When you want to insert a nail into a piece of wood, don't do anything fancy or glamorous. Just take the damn hammer and hit the son of a bitch until it's in."
Colonel Mekum: And what the hell does that crap mean in English, Captain?
Trivia: When Sargent Todd's combat and military record appears on screen, just before the title "between wars" is shown, you can see his different decorations. They refer to Kurt Russell's acting roles: "Plissken patch" (from "Escape from New York/LA"), "McReady" ("The Thing"), "Cash Medal of Bravery" from "Tango and Cash", and "O'Neil Ring Award" from "Stargate" where he played Jack O'Neil.