Other mistake: Once Earl stops the CAT at Burt and Heather's house, Val is standing on its roof directly above Earl. Val is looking and talking straight at them. The graboids shake the CAT, Earl drives it forward quite a bit (take notice just how far), but he looks up to tell Burt to hurry but he and Val are still facing in the same direction. They should be facing backward due to the distance they had to move up. Also, you'll notice that Burt is right in line with the trailer as he throws most of his gear. (01:14:30 - 01:15:30)

Tremors (1990)
1 other mistake
Directed by: Ron Underwood
Starring: Kevin Bacon, Fred Ward, Michael Gross, Finn Carter
Revealing mistake: Near the end, Val, Earl and Rhonda are way off the rocks after the blast. When the monster comes up out of the ground and Val takes off, you can see the "ground" bounce. It's definitely a false ground so they can get the "graboid" pushed up through it. (01:24:10)
Question: Wouldn't Burt and his wife get in trouble for having all the weapons in their house? Even in later movies, there is no sign they got in trouble and Burt continued to have all these big weapons on hand.
Answer: In some parts of the US, especially in far-out desert towns, home arsenals like this are the norm. There is really no limit on how many firearms or ammo American's can own. Machine guns are illegal, but can be permitted. If you have any semi-auto firearm, it's not hard to convert to a machine gun. Albeit, the firearm will fail apart fairly quickly from the abuse.
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Chosen answer: No, there's nothing illegal about any of the weapons they owned. Some of them may have required a Class 3 firearms license, but even this is not difficult (just expensive) for a law-abiding citizen to obtain.
Grumpy Scot