Atticus explained to the children the events of the previous night. and how people have their blind spots.
Mr. Cunningham's basically a good man, he just has his blind spots along with the rest of us
Jem, Scout, and Dill were waiting for the crowd to go in so they could sneak in, until Reverend Sykes showed up and offered them a seat on the balcony along with him.
The case was about to begin, the Ewells against Tom Robinson, being defended by no one else besides Atticus.
Mr. Tate was called up and questioned about the night of the events by Atticus.
Well I can tell you why I didn't, It wasn't necessary.
Did you call a doctor sheriff? Did anyone call a doctor?
Following on came Mr. Ewell, who was also intensely interrogated by Atticus, who later found he was left handed.
I most positively can.
Can you read and write?
Will you write your name and show us?
After Atticus had introduced a point to prove that Mr. Ewell could've been the one to beat Mayella due to him being left handed, Jem was positive about what Atticus said while Scout seem to question his remarks.