When Barbara and Captain Jack hold up a bullion coach, they do so by blocking a bridge with a tipped-over carriage. After they make their getaway, one of the coachmen gives chase on horseback from the bridge, but the tipped-over coach has now vanished.
The newspaper that first reports Barbara's and Jerry's exploits is dated Thursday, November 10th 1683. The 10th was a Saturday.
There is not slightest chance that a person, any person, could shoot from horseback at a man riding a horse and hit either the horse or the man in the 17th century. That is a not an easy shot using a much more modern 19th century rifled firearm. Hand guns in the 16 & 1700's were wildly inaccurate because of the lack or rifling and inconsistencies in the powder they used and in the lead balls they used as bullets. Add to all of this the fairly long distance at which the shot was made and the odds become mind-boggling.
The wedding scene shows two musicians playing clarinets. The clarinet wasn't invented until 1690. The movie takes place in the 1680s.
In the last scene, Margaret Lockwood's "mark" is clearly visible on the rug ensuring that her character's body is perfectly framed by the window as the camera pulls back.