The final lick utilizes even more notes that are not within mixolydian.
Specifically notes out of the C minor blues scale.
This is common for country and blues. It helps with the ambiguity that exists within the 12 bar blues progression by incorporating the major 3rd within the minor pentatonic scale.
Again, pay attention to the double stops. They are specified with a "ma".
I hope you have fun with these mixolydian country licks!
Until next time my friends!