The box office receipts were less than expected, so writer George Lucas continued Willow's story in books rather than in movie sequels. The three books are collectively known as "The Chronicles of the Shadow War" and share a writers credit for Chris Claremont and Lucas. They are: "Shadow Moon" (1995), "Shadow Dawn" (1996) and "Shadow Star" (2000)
As Val Kilmer was getting out of his crow cage between takes, the chain snapped and the cage came down on his foot. His resulting limp is evident during the scene in which Madmartigan and Willow arrive opposite Fin Raziel's island.
According to the press kits and subsequent novels, the two-headed dragon was named "Eborsisk", a reference to the movie critics Gene Siskel and Roger Ebert. The word does not occur in the film but made it into some reviews.
The earlier drafts of the screenplay contained more background information on the characters Madmartigan and Sorsha. Madmartigan was originally a knight of the kingdom of Galladorn (the kingdom that General Kael mentions having destroyed to Queen Bavmorda) and that the character Airk was the only real friend he had, but Madmartigan's recklessness got him into trouble, as did his love affair with an Eastern beauty that tainted the family name. Madmartigan had a chance to regain his honor in battle, but he ruined the chance by deserting; this explained some of the bitter antagonism between Madmartigan and Airk. Sorsha was originally the daughter of the king of Tir Asleen, who was a good man (he is in fact the regal old man seen at the end after the fall of Bavmorda and Tir Asleen is restored, and can be briefly seen in stone), which suggested that Sorsha had the capability to be good; during the battle at Tir Asleen between Bavmorda's troops, Madmartigan, and the monster, Sorsha encountered her father and he struggled through the stone to ask her for help, which prompted Sorsha to switch alliances from her evil mother to the good side. All of this was lost in the final film but does appear in the novelization as well as the comic book mini-series by Marvel.
Word from Ron Howard is that part of the two-headed dragon "Eborsisk" was modeled after Clint Howard, his brother. He stated that since Clint has had many cameo appearances in his films, and Ron couldn't find a part for him in this one, he modeled the dragon after him.
Willow originally said, "Goodbye, Elora Danan" when handing her over to Madmartigan. During editing, it was realized Willow wouldn't have known her name yet, and so it was redubbed, "Goodbye, little one."
A 13lb animatronics baby capable of moving its head and opening its mouth was used for the action scenes. This baby weighed more than the actual baby. And a more flexible prop baby was used in scenes where Willow falls with it.
During the close-up shots of the scene where Madmartigan and the soldier are being dragged behind the wagon, Val Kilmer was kneeling on a pedestal behind the wagon, while his stunt double was dragged behind letting the stunt man's legs take the beating.
Because of slow production during filming, the babies outgrew the props and the baby carrier that Willow had on his back, so they needed a new baby quickly. The second assistant director, Gerry Toomey, recommended his new born niece, Rebecca Bearman, although she was never credited. The scene where the baby is sick on Burglekutt was not written into the script. Willow walked with a limp which gave Rebecca motion sickness. When she was lifted up, she threw up over his head, and it was so funny they kept it in the film.
The twins who played Baby Elora never acted again. On his blog, Warwick Davis shared a picture in 2007 with a woman named Laura Hopkirk who says that she played the baby for the scenes shot in New Zealand, but she is not credited online.
Ron Howard was looking to do a fantasy film. He was at Industrial Light & Magic during the post-production phase of Cocoon (1985), when he was first approached by 'George Lucas' (I) (qv to direct. He had previously starred in Lucas' American Graffiti (1973), and Lucas felt that he and Howard shared a symbiotic relationship similar to the one he enjoyed with Steven Spielberg.
The Chinese government refused George Lucas the chance for a brief location shoot. He then sent a group of photographers to South China to photograph specific scenery, which was then used for background blue screen footage.
Various major film studios turned down the chance to distribute and co-finance it with Lucasfilm because they believed the fantasy genre was unsuccessful. This was largely due to films such Dragonslayer (1981), Krull (1983), Legend (1985) and Labyrinth (1986).
There is a continuity error that involves the Magic Acorns Willow was given by the High Aldwin. During an interview with The Empire Podcast, Warwick Davis explained that in a scene near the end of the film, he throws a second acorn and is inexplicably out after having only used two of the three Magic Acorns he had been given earlier in the film. Included in the Blu-ray release is the cut scene, in which Willow uses an acorn (his second) in a boat during a storm and accidentally turns the boat to stone. Davis says that his hair is wet in the next scene that did make it into the original version of the film, but the acorn is never referenced.
David Steinberg, the actor playing Meegosh, slammed into the side of an ice rink while ice-skating during production and cut his eyebrow open. The stitches were concealed with makeup for the scene where Meegosh makes his departure for home.
When Willow first meets Fin Raziel, she is in the form of a brushtail possum. She subsequently becomes a raven, goat, ostrich, peacock, tortoise, and finally a tiger before Willow succeeds in returning her to her human shape.
The fact the main character (played by Warwick Davis) didn't get first billing is quite common: Christopher Reeve, despite being the title character in Superman and Superman II, was billed third after Marlon Brando and Gene Hackman in the original and second after Hackman in the sequel. Other main stars given third billing include Martin Sheen in Apocalypse Now (after Brando and Robert Duvall) and his son Charlie Sheen in Platoon (after Tom Berenger and Willem Dafoe).
Warwick Davis smirked when Mark Northover in character as Burglekutt sarcastically laughs at him in the scene which Burglekutt decides to abandon Willow at the crossroads with the group and go home. It was kept in the film.
WILHELM SCREAM: It is heard three times: 1, during the chase scene after the escape from the tavern, as the soldier's chariot crashes and he is sent flying, 2, At Tir Asleen, when the Brownies trigger the large spear shooter that hits several soldiers, and 3, In front of Nockmaar Castle, as a horseman is cut down by the Army of Galladoorn, three seconds after the Brownies emerge from under a helmet.
Ron Howard nominated Bob Dolman to write the screenplay based on George Lucas' story. Dolman had worked with him on a 1983 television pilot called Little Shots that had not resulted in a series, and Lucas admired Dolman's work on the sitcom WKRP in Cincinnati (1978).
Kate and Ruth Greenfield never acted in any other films or TV shows after Willow (1988). Kate Greenfield went to De Montfort University to study Forensic Science and it is not known what Ruth Greenfield has done since Willow (1988).
A scene was filmed but cut, which during the battle at Tir Asleen, Sorsha finds her father whom has been turned to stone by Bavmorda and Sorsha's father communicates with Sorsha and pleads with Sorsha to side with Willow and Madmartigan and help them protect Elora Danan and defeat Bavmorda. Hence Sorsha betraying Bavmorda and succumbing to Madmartigan's affections for her.
This film shares an alarming number of plot and character similarities with another George Lucas film: Star Wars: Episode IV - A New Hope (1977). Willow Ufgood has several traits in common with Luke Skywalker, being a simple farm boy pressed into adventure by forces beyond his control. The High Aldwin is not unlike Yoda, guiding Willow's path with a fair amount of rustic comedy, and even the Aldwin's speech about magic sounds strikingly similar to descriptions of the Force. Madmartigan obviously mirrors Han Solo as a roguish, wisecracking mercenary with a heart of gold. His stormy romance with Sorsha, who features Princess Leia's royal lineage, sarcastic wit, and rebellious streak, treads familiar territory and even bears a similar leitmotif. Sorsha's mother, Queen Bavmorda, represents Emperor Palpatine, though he was not in Episode 4, using her supernatural powers to strengthen her grip on the world, including her faithful servant General Kael, whose skull mask, dark clothing, and cape resembles Darth Vader's villainous visage. Fin Raziel, forced into hiding by the forces of darkness and representing Willow's largest evolution into the world of magic, occupies Obi-Wan Kenobi's position in the story, or perhaps Yoda, more so. Funny as it may seem, Elora Danan shares commonalities with the stolen Death Star plans; she is protected by the heroes as their last hope, feared by the villains as their one weakness. To a lesser extent, Airk Thaughbaer's rocky friendship with Madmartigan mirrors Han Solo's difficulties with Lando Calrissian, who was also not in Episode 4. Their home kingdom of Galladorn suffers a similar fate to Alderaan, destroyed by Bavmorda's indestructible army. Rool and Franjean share traits with R2-D2 and C-3PO thanks to their comedic dynamic and occasional assistance to the main characters in times of need. At one point, the principal characters even wind up in a tavern not unlike Mos Eisley, filled with unrest and ultimately invaded by Bavmorda's army leading to a dramatic escape.
George Lucas initially visualized shooting the film in the way that he had shot Star Wars: Episode VI - Return of the Jedi (1983): with studio scenes at Elstree, and locations in Northern California. That idea eventually faded. However, some exteriors were done around Skywalker Ranch and on location at Burney Falls, near Mount Shasta.
Xena: Warrior Princess: Cradle of Hope (1995) bares a similar plot to Willow (1988). In that episode of Xena: Warrior Princess (1995), Xena (Lucy Lawless) and Gabrielle (Renee O'Connor) find a newborn baby in a basket on a river and they become the baby's protectors, when they learn that the baby was prophesied to sit on the throne of King Gregor (Edward Newborn) and the King's advisor Nemos (Simon Prast), whom secretly plots to overthrow the King, sets out to prevent the prophecy from being fulfilled.
Composer James Horner was known for frequently ripping off classical music in his scores. In Willow, the Elora Danan theme is taken from the Bulgarian hymn "Mir Stanke Le", while the heroic motif for Val Kilmer is clearly an imitation of the main theme of Robert Schumann's 3rd Symphony, "The Rhenish".