How deep the metal rod is pushed into the cannon changes between camera angles.
After Colonel Carter's fall, Doctor Keller states that she may have internal bleeding, yet gives her Ibuprofen. Ibuprofen can cause gastrointestinal bleeding but is not an anti-coagulant. It can slow down clotting, but only at high doses (higher than would be clinically administered).
Rodney states that, unlike Ronon, he will never be on the cover of Shape Magazine. Shape Magazine is geared toward women so it is doubtful that any male would ever be featured on the cover.