Continuity mistake: In the scene where the Graboid is pulling the truck you can see that there is a gun rack and a gun in it. Right before they are about to hit the rock you can see that the gun falls off of the gun rack. The gun goes on and off the rack between the following shots. (00:30:25)
Audio problem: In the scene where the Grabboid is pulling the truck with the chain attached and the guy is trying to shoot it, the gun noises do not match up with the muzzle flashes at all. At one point it is obvious he fires 2 shots, and yet 4 "bangs" can be heard.
Revealing mistake: It's very clear they blew up a model of the buildings. The grass seen just before the explosions is way too long and is not as long when the characters are running away. Further, the truck and the barrels have disappeared at the explosion shot.
Visible crew/equipment: When the Shriekers are trying to find Burt in the front loader (tractor with bucket) with their tongues, as the camera pans it catches the arm of a puppeteer controlling the tongue, in front of the front loader. (01:18:00)
Continuity mistake: When Burt is hiding in the bulldozer scoop, Grady looks down at him from the top of the oil tank and we see that Burt has his knife in his hand. However, in the next shot, we see him pull the knife out of its sheath on his leg.
Continuity mistake: In one of the first scenes when Grady and Earl are riding to the oil site, Grady attempts to take the last soda. If you watch Grady closely when Earl tries to play Rock, Scissors, Paper at first he is holding up his right hand, then it goes to Earl, then it goes back to Grady holding up his left hand.
Revealing mistake: When Grady & Earl blow up their first graboid, one of the pieces of orange goo that hits the truck flies in from the LEFT. All the other pieces of orange goo get flung in from the right.
Audio problem: There is a scene just after Earl and the new guy arrive at their base, when a truck (driven by one of the Mexicans I think) pulls up from the left hand side of the shot. If you listen you can only hear the truck's engine from when it comes into shot. This suggests that it was waiting just off shot and then drove in, rather than coming from any distance as you would have heard it approach.
Continuity mistake: Just before Earl gets sprayed with the fire extinguisher, he wraps a shirt around his hand. When he takes the shirt, you see he has no gloves on. Then when he asks for gloves the camera cuts to a different angle and the gloves are on him, even though he never even took them off the other guy.
Continuity mistake: In the scene when Grady says "son of a..." when the Graboid is dragging the truck, there is a shot of the truck driving forward.
Continuity mistake: After Burt gives the double rifle to Grady he closes the box he got the rifle from. Over the next shots the box changes from being closed to open and closed again two times as the shot changes.
Factual error: As Burt is driving, he is producing a video diary. He indicates it is 1900 hours (7PM) on May 14th, and yet it is pitch black outside. Nowhere in Mexico would the sun have set by 7pm in May.
Continuity mistake: At the end where the building explodes, everyone stands up from the pit. Burt is standing up in one shot, but in the next, he is kneeling down.
Visible crew/equipment: In the shot where the camera examines the hole in the wall and car made by Burt shooting the shrieker. You can see the shadow of the cameraman on the wall and his reflection on the car (near the top right corner).
Continuity mistake: The scene where Fred is trying to rope the ostrich he gets pulled for a couple of feet and looks up at the bird. If you notice his shirt is dirty from being pulled by the bird. When he gets up to meet the taxi his shirt is magically clean.
Other mistake: When Kate is introduced by Senor Ortega, she is introduced as Kate Riley, but the credits list her as Kate White.
Continuity mistake: When Earl enters the barn after being hosed down with CO2, the amount of vapor as he warms up varies from shot to shot with it almost not appearing to it heaving pouring off his clothes.
Continuity mistake: When Earl and Grady arrive at the radio tower and see that it's been all torn up, Grady sits down - we can see he has an ammo sling against his chest, as it is reflecting moonlight. The camera angle changes and his canteen is now in front of the sling. (00:54:15)
Continuity mistake: While driving in search of the graboids, the blue square blip on the seismometer represents their truck, and it's moving. However, when they are using the RC truck, the seismometer shows the blue blip is still moving, but the truck is now immobile.
Continuity mistake: Earl and Kate are talking about dating at the end and walking with Burt and Grady towards the hole in the ground. In the first shot, it appears to be overcast. Suddenly the sun appears on everyone.
Answer: According to IMDb it was released directly to video. According to Tremors fan sites, SciFi channel currently doesn't plan to release the series on DVD.
Andreas[DK]