W. Earl Brown (R.J. Watts) has several westerns under his belt including Longmire. Some of his other credits include: The Cherokee Kid, The Alamo, Deadwood, Justified, The Last Rites of Ransom Pride, Longmire, The Lone Ranger, and Deadwood: The Movie.
Alma Sisneros (Shadow Young S02 E04) and Amber Midthunder (Lilly Stillwater S01 E01 and S03 E03) didn't work together on Longmire but, have multiple projects in common: Longmire, The Originals, Hell or High Water, and Roswell, New Mexico.
At 0:24:49 Walt mentions that the activist group E.L.F. "sabotaged a fracking operation." Fracking is the process of drilling down into the earth before a high-pressure water mixture is directed at the rock to release the gas inside. Water, sand and chemicals are injected into the rock at high pressure which allows the gas to flow out to the head of the well. Fracking is also a common curse word in the t.v. series Battlestar Galactica. Katie Saccoff (Vic) formerly played the character Starbuck on that show.