As an added technique Charlie used approach notes.
He would outline chord shapes like the ones we’ve seen and add the notes from the major or mixolydian scale.
But to get from one note to the other he would often make chromatic lines.
The passing notes would sound “off” if you landed on them and stayed there.
But they work great as a connection between chord / scale notes.
As you can see in the next example; you can get away with a lot when playing these approach notes as passing note.
This principle was a very important ingredient in Charlie Christian’s solo’s.