Trivia: After this episode, all the GDO codes are changed and the SGC will now do screenings in case of the aliens returning.
Trivia: P3X-118 is locked-out of the dialing sequence.
After Dr. Fraiser gives Sam the needle and she passes out, you can clearly see the still-full syringe in Dr. Fraiser's hand.
The man that Teal'c shot with the zat gun who shot him died, yet his hologram did not deactivate as it happened with the alien impersonating Jack when it died. He was an alien as he said "Alert General Hammond" when he checked the unconscious guard in the elevator for the mimic device so this shows that he was an alien.
Maybourne: Major, a chemical spill causing paranoid delusion is more plausible to me than aliens taking over the SGC.
Sam: My God. You don't think I can tell the difference between the two? What was I thinking?
(attempting to rescue Teal'c by pretending to the guards to be an alien)
Jack: (monotone voice) I have come for the bald prisoner.
(the guards open the door and Jack steps inside)
Jack: (to Teal'c) You will come with me.
Teal'c: I will submit to no further experiments.
Jack: Oh, but you will...
Sam: They self-destructed.
Teal'c: Their destruction appears to be complete.
Sam: That's a lot of damage
Jack: Coat of paint... a little touch up. It'll be fine.
Jack: How is a needle in my butt gonna get water out of my ears?
Fraiser: It isn't. Come on sir, you know this is standard procedure.
Jack: We should rethink this procedure.
Daniel: The remnants of a temple we discovered led me to believe we'd found Kheb. The planet Sha're told me about.
Teal'c: However, there was no sign of Amaunet's Harsesis child.
Jack: (shouting) Just rain. Much rain. Wind, lightning, hail. Did I mention the rain, sir?
Daniel: We were affected by the fumes the moment we got in the elevator.
Jack: Didn't even realize it was happening. I vaguely remember having some water in my ear, that's it.
Jack: All right. Exactly what are the side effects of this tetrachloro... ethyl mermaline stuff?
Sam: Hallucination, delusion.
Jack: Paranoid delusion, I think it was, but go on.
Maybourne: I fully intend to return with you just to make sure everything's all right.
Sam: (to Jack) And you agreed to that? (to Maybourne) Shouldn't that tell you something?
(preparing to engage the aliens)
Jack: Sure you're up to this?
Teal'c: As always.
Jack: You're an animal.
Jack: Maybourne? how -
Sam: I called him, sir.
Jack: ...? Willingly?
Sam: Maybourne, you are an idiot, every day of the week! Why couldn't you have just taken one day off?!
Alex Zahara and Dion Johnstone also appear in "Beast of Burden" and would again be reunited in "Metamorphosis" They have both played eight different characters on Stargate SG-1.
The room in Level 23 that all of the people who have been replicated by the aliens was actually a redressed version of the gate room! Look at the blast door behind all of the people there and it reads C 3L and the blast door to the left, it reads C-2 same as the gate room!
Syndication airdate: February 12, 2001.