You can often tell when a studio is losing interest in a film series when they start replacing the entire cast. In this instance, they did it twice in 2 films-- and by the time of THE CASE OF THE STUTTERING BISHOP, we'd not only seen 3 Perry Masons in 6 films, but 5 different Della Streets! Donald Woods does his 2nd PM film, having played one of the suspects in ...THE CURIOUS BRIDE, while William Clemens directs his 2nd PM film, having already done the relatively sober ...VELVET CLAWS. Clemens would go onto quite a few series films, including a Torchy Blane, 4 Nancy Drews, a Dead Ends Kids, a Philo Vance, and 3 Falcons. There's nothing especially flashy or stylish about this film, and it starts out very confusing, but it is a solid mystery film, and gets better as it goes.
For example, you have the boastful house detective who Perry winds up hiring part-time, and as the story goes on he proves to be genuinely helpful, rather than "merely" comic relief. It seems the murder takes forever to happen in this one, but once it does, the story FINALLY kicks into gear, and the courtroom sequence at the end is probably the BEST in all 6 films. Unlike when Perry rattled off confusing info nobody but HE knew in the previous installment, the quick stream of witness testimonies actually help to pull all the threads of the story together neatly. And at last, there's the patented "blurted out confession" seen in so many PM stories-- only in this case, NOT from the person being grilled on the stand.
It's been said that sometimes casting actors very accurate to novels can lead to dull films. Some of the most popular versions of characters are quite unlike their literary sources-- good examples being Sean Connery's JAMES BOND and Stacy Keach's MIKE HAMMER. In this case, I find myself wishing Warren William had done more films like this one-- his version of Perry might not be thought of as so much of a joke then.
