Odette Annable (Geri Broussard) and guest star Dave Annable (Dan Miller) are married in real life.
In the prequel show of Walker, "Walker: Independence" Cordell Walker's ancestor Abby Walker, adopted the name Walker to hide after Tom Davidson killed her husband and shot her. If the Davidson in this show are the descendants of the same Davidsons, Liam is right in saying "they started it". Walker was chosen as Abby's last name after the Apache tribe that saved her called her "the one who walks in tall grass" based on where they found her shot and collapsed.
Jared Padalecki (Cordell Walker) and Paula Marshall (Gale Davidson) both appeared in Cheaper by the Dozen (2003), although they don't share any scenes together.