Todd tells Donny, he can't come down to the until he puts on a tie. Donny says he hasn't worn a tie since his mom's funeral when he was 3 but in the court room seen young Donny is wearing a tie for the trial.
In the scene after Grandma finds all of the tissues on Donny's bed, Todd goes into the bathroom to wash his hands. When Todd comes out of the bathroom, the light is on, but when Donny says the line about "La Vida Loca," the light is off.
When everyone is visiting the church, we see Chad in his USMC uniform with the correct PFC rank insignia on his sleeves. For a brief second he is seen with a Corporal's insignia which switches back to PFC in the next shot.