Factual error: When Robert Kennedy receives news about his brother John's assassination, he is in his office at the Department of Justice. RFK was actually at home eating lunch when he received that phone call.
Factual error: In the medicine cabinet, when Margaret is emptying it, a box of Rite-Aid Bandages is visible. Rite-Aid is an American chain of drug stores, not in the UK. And the Brits call the product plasters.