When the safe is first found, the clenched fist handle is vertical. When taken to the station, the handle is horizontal. One of these is the open position.
Bennett is seen giving Rose an engagement ring. This is highly unlikely. While we take it as an obvious thing to do in this day and age, the act of giving a ring as a symbol of engagement did not exist in widespread culture until the DeBeers Company created it as part off an ad campaign in 1938, more than 40 years after this episode takes place.