Goofs

At the beginning, when Father Tom gives Karen the necklace, both the chain and the attached cross are silver, but when the masked murderer rips the necklace from dead Karen's neck at the communion, it is gold.

At the beginning, in the two alternating camera angles of Mrs Tredoni on her knees scrubbing the rectory kitchen floor: in the low angle, there are no soap suds on the floor - just a few wet spots, and in the high angle, the floor in front of her is covered in soap suds.

The original poster claimed, "When Dom gets stabbed the knife falls and lands into the railing, but in the next scene the knife is missing." However, the second shot is, in fact, a tighter shot and the knife is simply out of frame.

In the very shot before Alice's mother asks Dom should she go back, he is holding hands on her shoulders, but in the shot where she asks him that, he is just standing in front of her.

When woman is scared by Alice at the start of the movie, her position is different in two continuous shots.

While Father Joe is saying the climactic Mass, he repeats the Penitential Rite ("Domine,non sum dignus": Lord, I am not worthy) twice.

In the opening credits Atonino Rocca is credited as the funeral director but in the ending credits he's credited as a funeral attendant.

The period detail for this film, set during 1961 but actually shot in the mid 1970s, is quite good save for one very large gaffe: almost every male actor in it has obviously 1970s hairstyles, much too long for a story set in the early 60s.

After Alphonso is stabbed he falls down on a coffee table causing it to collapse. A pair of hands is visible as they catch a falling fish bowl.

When Mrs. Tredoni answers the door for Catherine at the rectory, the boom mic is visible in a mirror.