In a military funeral the 21 gun salute is done before the flag is folded and presented to the bereaved, because the bullet casings are folded into the flag.
The missing man airplane formation was done incorrectly. The "missing" airplane should pull out of the formation before the flyover.
When Ando is summoned to pick up Hiro from the police station the subtitles for the officer's translation reads "If not, we wouldn't not have known to call you."
The flag presented to Angela at Nathan's funeral is improperly folded. No red should be visible.