It happens more that you might suspect. An excluded juror with the same or similar surname to an accepted juror sits on the panel hearing the case. Sometimes the mistake is realized after a few moments. More troublesome is when the mistake is realized during opening statements or in this case, after the verdict. The defendant was convicted but when the mistake was brought to his attention, Judge Will Thomas did not shed a tear or waste a moment in declaring a mistrial. The Herald story by Ovalle is here.
Your Friday afternoon moment to laugh: Texts from A Cat.
Read it. You will laugh.