What were 3 things in Mrs. Barnett’s testimony, with Mr. Jamison, that should have convinced an honest jury that TJ was not the murderer and the actual attackers were not black?

Mrs. Barnett could not swear the intruders were black men.

TJ's description (height) didn't match the height given for the murderers. She could not swear it was TJ.

Mrs. Barnett was not wearing her glasses.