The beads used throughout the programme are crystal but when Miss Cost retrieves them from the rock pool and holds them up they are clearly akin to pearls.
Elspeth Cost's ceremony at the falls is disrupted by a serious rainfall. And yet, clearly the sun is shining all through the scene.
At 1:12 when someone breaks into a shop when no one is inside, there's no way for the key to be left in the lock on the inside of the door. The last one to leave would have needed it to secure the premises from the outside.
At 55 minutes, when he entered the room that appeared suspiciously like the scene of recent criminal activity, Alleyn would have known better that to lift the ominously-adorned statue with his bare hands, obscuring any fingerprints the culprit might have left.