This episode was novelised by J.M. Dillard, who has written many Star Trek books. It is based on the script featuring a few scenes that either were deleted or never filmed, and even gives away the aliens' planet name of Mor-Tax before it was revealed in the series. However, it also contains a subplot revolving around an alien revolt and the integration of Dr. Clayton Forrester. This and a few other additional pieces of background information do not align with information with both the episode itself as well as the rest of the season, making the bulk of the novel non-canon.

This episode originally aired as a single episode in most countries and is on the DVD set as such. However, in subsequent airings it was broken up to make it a two-part episode.

Chambers: You know, there's something about the irony of pirating a U.S. communications satellite to broadcast our demands always makes me smile.
Urick: Smile on camera, no one will take us seriously.
Chambers: Well, then we'll just have to blow up this dump! And send a big fat radioactive cloud of nuclear waste floating over their nice middle-class homes! (lightly) Right?

(Norton offers Suzanne a cup of his own brew of coffee)
Norton: You like it black, I hope.
Suzanne: Yes, Norton, I like it black.
Norton: (to Harrison) She can stay.

Ironhorse: Around here, doctor, it's need-to-know. And you don't need to know.

(Einhorn is filling the truck with gas)
Doc: Why don't you let me do that, fella?
(Einhorn doesn't respond)
Doc: Well, have it your way. Where ya headed?
(Einhorn nods his head to the left)
Doc: Oh. Where ya comin' from?
(Einhorn nods his head to the right)
Doc: Talkative, ain't ya?

Doc: (seeing radiation sores on Einhorn's face) Son, you best start bein' a might more careful about bein' out in the sun without a hat.
(Urick and Chambers, also scarred, walk out from the truck and approach him)
Doc: You folks got some kinda communicable disease or somethin'?

Harrison: What would you say if I told you that Earth was being invaded by aliens from another planet?
Suzanne: Read my letter.
Harrison: I'm serious!
Suzanne: Okay, see a psychiatrist first, then read my letter. It's my resignation.

Harrison: In 1953, we experienced what can only be described as a War of the Worlds. If it wasn't for common, every day bacteria attacking the aliens' immune systems, they would have won this war, and you and I would not be having this conversation.
Suzanne: But we are having this conversation, which I don't want. So I fail to see your point.
Harrison: My point is that all though the bacteria stopped the aliens, I don't think it killed them!
Suzanne: Excuse me, but I think you have been sitting too close to your television set.

Orel: This thing looked like a gorilla, only it weren't no gorilla 'cause I seen a gorilla one time at the zoo, and this gorilla didn't have no hair like that other gorilla did. This thing picked up ol' Doc by the throat and throttled him.
Sheriff: Can you identify anybody else, Orel? Maybe did ya get a license?!
Orel: License?! I'm tellin' you about gorillas that ain't good, and you're asking me did I get a license?

Ironhorse: We had an incident involving suspected terrorists. There's a good chance they've been through this area.
Orel: Terrorists. Hot damn! I knew it! Didn't I tell you, sheriff? (to Ironhorse) I've been reading about this here guerilla warfare. Only thing is, I didn't know those, uh, terrorists use real gorillas.

Ironhorse: This is weird stuff we're dealing with here, Blackwood. Bolas, terrorists that don't act like terrorists, terrorists that don't die like terrorists. I actually saw a body dissolve after I shot it.
Harrison: We all saw some fairly extraordinary phenomena, Colonel.
Ironhorse: When in God's name is someone going to start explaining things to me?
Harrison: I've already explained as much of it as I understand myself.
Ironhorse: You've explained nothing, mister. I don't believe in ghosts, and I sure as hell don't believe in aliens from another planet.

Ironhorse: Welcome to government property #348, also known as "The Cottage". 25 totally secure acres in the middle of nowhere. Without proper authority, no one comes in... no one gets out.
Norton: Hmm. Makes pizza deliveries a bit rough.

Suzanne: (hearing a noise outside the hangar) What is it?
Ironhorse: Helicopter.
Harrison: Bad guys or good guys?
Ironhorse: Considering what we're doing, doctor, even the good guys are bad guys.
(the helicopter blows open the entrance with a missile)
Harrison: Bad, bad guys!

Urick is standing at the back of the truck, in front of the door when she opens it. However in the next shot, when the ATVs fly out, she is gone.

The position of the soldier Urick shoots is different when Mossoud finds him later.

It's unclear how the waste that melts the steel drum doesn't appear to hurt the alien when it worms its hand out. It doesn't even appear to burn the wooden platform seperating the stacks of barrels.

When we first see Harrison and Suzanne parked at the roadblock, Harrison has a cup in in his right hand. When it cuts to the next shot, it's gone.

During the raid at the farmhouse, the aliens wrap one bola around Ironhorse's legs, which trips him, and then a second around his torso. However, after Harrison cuts the one to free the colonel's arms, Ironhorse then cuts not one, but two around his legs.

When the two possessed pilots begin operating the helicopter, a close-up shot shows one of their gloved hands flipping switches despite previous shots making it clear that neither one is wearing gloves.

When Harrison is tapping the grid of the alien fighting-machine, the close-up shot is inconsistent with the rest of the scene. Harrison had just taken off his cap, which he never puts back on, and the grid is aiming downwards. Harrison is not only wearing the cap in this shot, but it is the only time in which the triangle-shaped lock is aiming upwards.

The length of Norton's hair is not consistent throughout the episode. Through most of the episode it is cut close to his head, as it is throughtout the rest of the series, but in a few shots, his hair is clearly grown out more.

Harrison: Have you ever heard of Hangar 15? [...] The place where the air force stores all its UFO evidence?
Ironhorse: You mean Hangar 18? Building 18 at Wright-Patterson?

Hangar 18 is a part of Ufology that became incorporated at least in part because of the 1980 film Hangar 18. Allegedly, the UFO wreckage of the infamous Roswell incident was taken to Hangar 18 (referred to as Building 18 at times) at Wright-Patterson Air Force Base in Dayton, Ohio.