After Eugenio has burst open the door (approximately at 17:30), the lights in his flat are on. The lights are still on as he talks to his neighbor Marta. When he finally stands up, his flat is in the dark and all the lights are off.
When Marta is babysitting, the audio of the little baby is clearly fake. The child himself is not crying at all but is seen often smiling or simply looking at the camera. The crying voice is provided by a crying doll that was widespread in those years in Italy.