These are just a bunch of random Bellatrix facts:
- Actress Helena Bonham Carter stated that Bellatrix suffers from a sadistic personality disorder. However SPD is no longer recognised as a valid mental disorder by the DSM so were she a real person (and alive) it is more likely that Bellatrix would be diagnosed with histrionic personality disorder.
- Bonham Carter is notable for frequently playing Bellatrix-like characters (such as Mrs Lovett in Sweeney Todd).
- Originally, Helen McCrory was going to play the role of Bellatrix in the film version ofHarry Potter and the Order of the Phoenix, but due to her pregnancy, she opted out of the film and was replaced by Helena Bonham Carter. Ironically, Bonham Carter herself learned she was pregnant shortly after completing filming. McCrory was eventually cast as Bellatrix's sister Narcissa in the film version of Harry Potter and the Half-Blood Prince. In the film, Carter is noticeably wearing looser clothing, as opposed to her form-fitting costume of the previous film (see below).
- In the Order of the Phoenix film, Bonham Carter's costume reflected the mental state of the character, thus the torn gloves and dress, she also had alternate attires with a hood worn up and a mask, but they were not used in the final cut of the film.
- On the tapestry depicted in the film, the face of Bellatrix pictured is a face of Helena Bonham Carter. On the DVD there is a different picture of Bellatrix on the tapestry, where she has a purple hat and looks stylistically similar to her sisters.
- In the book version of the Battle of the Department of Mysteries, Bellatrix casts an unnamed spell that knocks Sirius Black through the veil in the Death Chamber whilst in the film version, she casts the Killing Curse at him and he dies before falling through the veil.
- There is a notable difference between Bellatrix's personality from the books and her portrayal in the films where her hot temper and reflexive attacks have been largely omitted. Bellatrix is also often shown in the film adaptation of Harry Potter and the Order of the Phoenix and the film adaptation of Harry Potter and the Half-Blood Prince, to have a more deranged quality about her that is not as established in the books in which she is typically more severe and murderous. For instance, during the Skirmish at the Burrow (a scene that occurs only in the sixth film), Bellatrix adopts her raucous mocking of Harry Potter, repeating the childish, sing-song phrase used in the fifth film: "I killed Sirius Black!" Followed by, "He's coming to get me!"
- The house-elf Kreacher has a great fondness for Bellatrix. Harry Potter eventually came to understand that Kreacher responds to respect and kindness, and Hermione Granger realised that Bellatrix and Narcissa were indulgent with him, in contrast with Sirius' abuse. When they were kind to him, he gave them the information that they wanted.
- Sirius Black told Harry Potter that Bellatrix ran in the same crowd as Severus Snape while at Hogwarts, but her date of birth makes this impossible. Bellatrix would have attended Hogwarts from 1962 to 1969, or possibly 1963 to 1970, depending on which month in 1951 she was born in, whereas Snape began his schooling in 1971. This may simply be an error, as J. K. Rowling has admitted that maths is not her strong suit. Another possible explanation could be that both Bellatrix and Snape went around with the same type of people, some of whom may have overlapped depending on age.
- Bellatrix's wand is 12¾" walnut wood, with a dragon heartstring core. It was described by Ollivander as "unyielding."
- Helena Bonham Carter who portrays Bellatrix in the films, described the character as being "as bonkers as they come", commenting that Bellatrix has "a bit of a child-like madness... like boys who like to pick apart an insect for the sake of it."
- In the film adaptation of Harry Potter and the Half-Blood Prince, Bellatrix participates in the Battle of the Astronomy Tower but in the book there is no mention of her. Also, a new scene has been added of The Burrow being attacked and burned over the Christmas holidays by Bellatrix, Fenrir Greyback, and an unknown Death Eater, possibly Amycus Carrow, Yaxley, or Thorfinn Rowle.
- J. K. Rowling stated in an interview that she had always intended that Molly Weasley would be the one to kill Bellatrix, for two main reasons: Firstly, so that Molly could "have her moment" and show that simply because she had dedicated herself to her family didn't mean that she wasn't a powerful witch, and second, to show the clash of Molly's "maternal love" against Bellatrix's "obsessive love" She considered Neville might be the one to kill Bellatrix as revenge for torturing his parents.
- In the film version of Harry Potter and the Half-Blood Prince, Bellatrix appears in the adapted scene of the Battle of the Astronomy Tower despite there being no mention of her presence there in the sixth book. Also of difference is the fact that there is no literal "Battle" between the Death Eaters and the Order of the Phoenix during this scene; allowing the former group to pass through Hogwarts without resistance and Bellatrix to walk insanely on the Gryffindor table in the Great Hallbefore casting a spell to destroy all of the Hall's many windows. It is during the segment in the Astronomy Tower that Bellatrix speaks the line, "well done", to Draco for cornering Dumbledore. In the book, it is Amycus Carrow who congratulates Draco for his work. Bellatrix then proceeds to order Draco to hurry and murder Dumbledore, in place of Yaxley(who does not make a true appearance at all in the film). Also different in this section of the film is that Bellatrix casts the Dark Mark into the sky after Dumbledore's death, whereas in the book, it is Death Eater, Gibbon who does so prior to the death of the Headmaster. Finally, Bellatrix (in the film) is shown to perform the main acts of crime that were committed byThorfinn Rowle in the book. These include burning down Hagrid's hut (although the film shows the burning process to be more explosive than it was described to be in the book) and briefly torturing Harry with the Cruciatus Curse.
- Bellatrix's wanted poster is featured on an official Warner Brothers Harry Potter t-shirt. It says that Bellatrix was convicted for murder. In the book, she was sentenced to Azkaban for her participation in the torture of Frank and Alice Longbottom.
- If Bellatrix's enemy, Harry Potter, is the grandson of Charlus and Dorea Potter (nee Black), then Bellatrix (along with her sisters and cousins) would be the second cousin of Harry.