Character mistake: Issei meets with a journalist to tell her that he has decided to end his participation in the contest to win the estate. She hands him her business card, which he immediately puts in his pocket. This completely violates the Japanese traditional business card ritual, which includes looking carefully at the card (a sign of respect).
Character mistake: Joe called Cruz a Sergeant First Class (E-7), which is a US Army rank. It was established in Season 1 that Cruz is in the US Marine Corps, so she would be a Gunnery Sergeant (E-7). (00:19:48)