Jack and Truscott sit after singing, and their positions change between shots.
When singing "Dem Bones" outside the pub, the rightmost rider in white breeches goes from standing to kneeling between shots.
After falling, Charles' hand is inside his jacket, but in the next cut, his hand is extended along the floor.
After the doctor arrives at the manor, Tucker pours drinks. The drink jumps from his hand to the tray.
When the 13th Earl says, "Lord what will you do" to Claire, his right hand changes positions.
The Lords are all wearing coronation robes in the House. In practice these are only worn at the coronation. At other times the Lords wear lounge suits.
The police car arrives at the estate on a gravel driveway, however, we hear the sound of screeching tires on asphalt.
The technique of the string players in the orchestra, particularly their bowing, at the wedding reception (c.71 minutes) bears absolutely no relation to the soundtrack.
When they are burying Lady Gurney, the camera casts a shadow over the grave stones and ground.
The 13th Earl is referred to as "Ralph". Upper class pronunciation of this name is always "Rafe". All the characters (and actors) would know this.