Walker's full last name is "Firewalker". When his parents died/were killed, he went to an orphanage where the others teased him because he didn't look like a Native American. Therefore, he shortened it to Walker.
When meeting a stranger he doesn't like, Walker doesn't take off his hat or shake the guy's hand. For example, when he's having a conversation with millionaire racist in "Deadly Reunion" and when he's speaking with a racist army captain in "Patriot."
The award that C.D. receives for his career in Texas law enforcement is called "The Frank Hamer Award". The award is named after the legendary Texas Ranger who began his career on horseback in the wild west of the 1890's and retired during the gangster era of the 1920's and 1930's. Hamer is best remembered as the man who led the posse that killed Bonnie and Clyde.
Dallas detective Carlos Sandobal (Marco Sanchez) and martial arts instructor/private detective Trent Malloy (Jimmy Wlcek) were with the show from 1997-1999 as regulars. Their names never appeared in the opening credits.
The exterior view of "C.D.'s Bar and Grill" is actually the legendary White Elephant Saloon located in Ft. Worth's Historic Stockyards District. When it was built, the White Elephant was owned and operated by wild west gambler/gunfighter Luke Short, a friend to such famous figures as Wyatt Earp, Bat Masterson, and "Doc" Holiday.
In the show, the Rangers' headquarters are located in Dallas, but the Rangers' headquarters is actually in Austin. The building shown as the Rangers' headquarters is actually the Tarrant County Courthouse in Fort Worth. In real life, the Rangers' headquarters for Dallas-Fort Worth is the Company B headquarters in Garland.
At least 16 actors from the 4 'Lethal Weapon' films (1987-1998) have appeared on this show. They include Sven-Ole Thorsen (in an uncredited appearance in the second episode), Tom Atkins, Mitchell Ryan, Gary Busey (as a character named Riggs), Ed O'Ross, Grand L. Bush, Sherman Howard, Mark Rolston, Dean Norris, Nick Chinlund, Henry Kingi, George Kee Cheung, Roger Yuan, James Wing Woo, Francois Chau, and James Lew.
The trivia items below may give away important plot points.
At the end of the episode "Avenging Angel", it was explained that C.D. Parker (Noble Willingham) had taken sick while on a trip and passed away But, in the final episode "Final Showdown" it was revealed that C.D. was murdered.