I liked it, but this sort of thing always bugs me

They make a big deal about the Ripper maybe being left handed, maybe right. The inspector can't be sure either way; he just knows the RH print lifted from the glass doesn't match the print he already has. In the event, the Ripper turns out to be favoring his RH, which implies his practice was to attack frontally, not from behind as originally thought. Well spotted! (To be picky, even if the inspector originally had good reason to assume the Ripper was LH, it's doubtful if he would have had good reason to assume the first print was RH, besides which there were ample grounds to arrest the suspect and then obtain prints from both RH and LH!)

The sort of thing that bugs me is when someone who's supposed to know how to use a gun jabs it vigorously toward the target each time he fires, as the inspector does here... ach, movies.

"I beseech ye in the bowels of Christ, think that ye may be mistaken."

For some reason it reminded me of Seance on a Wet Afternoon.