Goofs

When the camera is panning across the record player, when Marcus is playing the 'child's song', the stylus is silver whereas in the next shot when the record is stopped the stylus is completely different (a red one instead).

When Marc is exploring the old mansion, we see some white dust in his shirt even before he scratches the wall, revealing the drawing and liberating such white dust.

In Carlo's lover's bedroom we see them leaving in the following order: first Carlo, second Marcus, and third Carlo's lover. But they reach the door in the order: first Carlo, second Carlo's lover, and third Marcus.

After the Murder of Amanda Righetti when Proff Giordani is in the Bathroom of her house. He is seen talking to the maid as he has just discovered the message on the wall, He begins to scratch the right side of his head leaving his hair messy. But in the next shot as he is leaving the room we see his hair is back to its normal position.

When Giordani is having his teeth banged into furniture, the edges of the furniture can be seen bending.

When Carlo is being dragged along by the truck, the wheels he is on are visible.

The wires controlling the bird are visible when it flies into the knitting needle.

The text for "The House of the Screaming Child" contains a typo in the second paragraph. "The to friends" instead of "The two friends".

Marc plays a piano one-handed in his loft but sounds like he's still playing with both hands (ie, treble and bass notes together).

The notes being played during Marc and Carlo's duet in the bar sound nothing like what they appear to be playing (the high notes sound much faster than what the actors are miming).

When Helga Ulmann is introduced during the séance, she is said to be Lithuanian. When her murder is announced on the TV later in the film she is said to be German, which would explain her talking in German on the telephone just before the murder.