The mysterious nocturnal opening of Anne's window is to be remedied with bars placed across it - but when the workmen are seen at work, they are going to bar a sash window, which doesn't open outwards, but slides one panel of panes behind another. Furthermore, the bars are on the inside of the window, so why were the workmen climbing ladders on the outside of the house? They would have done the work inside the house.
As noted above, when the workmen are working on the window, it is a sash window, but when seen from the inside, as when it is flapping in the wind, Lady Anne's window opens like a door.
When Anne's windows are banging, they are shown to have no glass in them.
When the corpse is discovered hanging in the room, the cadaver has his knees folded, because the floor is close to the hanged man's feet.
The murdered man was paralysed due to a severe stroke, and was unable to stand or support himself in any way, so it would not be necessary for the killer to hang him much above floor level.
As the climactic fight takes place for several minutes, the five militia men standing by the front door remain rooted to the spot, making no attempt to rescue the goodie or arrest the baddie.
The hero and the villain were engaged in a duel, which, at the date the film was set, would be perfectly understood by the militia.