Character mistake: In his opening prologue, Burt says the Graboids have been contained to the Northern Hemisphere, showing a map highlighting the Graboid attacks of the first film in Nevada and the second film in Mexico. However, it overlooks the Graboid/Shrieker attack in Argentina, in the Southern hemisphere, shown at the beginning of Tremors 3, an incursion Burt personally put down. It's not like it was classified - characters in that movie talk about it being reported by CNN, and characters in the Tremors TV series talk about it as well. And it's not like Tremors 3 is no longer canon, since Burt makes two references to being swallowed by the Graboid in that movie (which also becomes a plot point in Tremors 6).
Tremors 5: Bloodlines (2015)
1 mistake - chronological order
Directed by: Don Michael Paul
Starring: Michael Gross, Brandon Auret, Emmanuel Castis, Natalie Becker
Burt Gummer: That's right. Fly right into my crosshairs, you fire-farting son of a bitch.
Trivia: Had the longest gap between films for any movie in the series. "Tremors 2: Aftershocks" was released six years after the original. "Tremors 3: Back to Perfection" was released five years after "Tremors 2." And "Tremors 4: The Legend Begins" was released three years after "Tremors 3." By contrast, "Tremors 5: Bloodlines" was released a full eleven years after "Tremors 4."