Unfortunately there were also facts related to the murder which weren't shown explicitly in the film and these missing facts have a rather profound effect on the perception of this crime. Jackson attempted to convey the missing pieces of information indirectly, but he was only partly successful in his attempts, judging from the perceptions of many viewers.
The most glaring difference between the murder shown in the film and the real-life murder deduced from the full set of forensic evidence was the extreme violence of the real-life murder, which was far in excess of the film's version, horrific as that may have been for most viewers.
One important detail not shown in the film was the fact that Honora was found lying on her back. Coupled with the nature of her injuries (see 7.2), it was clear that she had faced her assailants through most of the attack. It was also clear that she had fought back against the attack.
The next most important omission concerned the emotional state of all three principals. There was evidence entered into testimony of a violent argument between Pauline and her mother immediately preceeding the murder, and Juliet may have also participated in this argument.
The extremely powerful impact of the murder scene in "Heavenly Creatures" upon the audience is proof that Jackson succeeded in portraying, in part, the spirit of the crime, but some of the bare facts of the case carry an impact that is even greater.
In the murder sequence, Jackson has Honora cry out horribly. Many viewers commented to me that Honora's cries were very distressing to them. This is a very subtle but important reference to the events in the real murder. Similarly, Jackson also showed Pauline crouching behind Juliet when Juliet picked up the brick, and the sound of Juliet's blow, in particular, was another very important piece of innuendo. Pauline's tone of voice was also a muted piece of innuendo pointing to the possibility of anger during the murder.