Michael Gross actually ate the grub his character is shown eating.
In Nov. 2018, Michael Gross posted a picture of himself from the film on social media with the caption, "Burt Gummer as you've never seen him before." It showed Gross with long white hair and a thick white beard.
Michael Gross grew out his beard his character has during filming.
Michael Gross is the only actor to have starred in all seven Tremors movies, as well as the television, series. He played Burt Gummer in six of the movies and the series. In the fourth movie, he played Hiram Gummer, an ancestor of Burt's.
As promotional content for the movie, Burt Gummer (Michael Gross) announced his candidacy for President of the United States of America in the 2020 election on YouTube.