The character Becky was not originally to be hearing-impaired, but after an outstanding audition, the role was given to Aryana Engineer.
While filming a fight scene with Milla Jovovich, a mishap occurred causing 16 actors to fall off a scaffolding and sent to the hospital. As a result, filming was shutdown for a few days and Jovovich visited some of the actors in the hospital out of respect.
Bingbing Li's entire dialogue was dubbed by Sally Cahill who voiced Ada Wong in the video games (Resident Evil 2 (1998), Resident Evil: The Darkside Chronicles (2009) and Resident Evil 4 (2005)).
(at around 52 mins) During the car chase with the Zombie Russian army the music playing is called 'Phantom Chase' by tomandandy. This references music from the original Resident Evil (1996) video game, particularly 'Second Floor Mansion'.
Michelle Rodriguez played a third character. Apart from her good and evil versions she also portrayed a zombie doppelganger. As Ada Wong explains Umbrella tests every clone in different levels of Biohazard. The scene was cut in the editing process along with many scenes in the suburban house with Alice and her family.
The idea of cloning the umbrella soldiers may have stemmed from a comment made in an audio commentary of the original Resident Evil (2002) film. Michelle Rodriguez said that Colin Salmon should be brought back in a sequel as a clone. Ultimately, this came true for Salmon as well as Rodriguez and Oded Fehr.
The scene between Ada Wong and Alice in the underground office is a re-enactment of the scene in Resident Evil 4 (2005) where Leon S. Kennedy meets with Ada for the first time in the Salazar Family castle bedroom. Wong wears the exact same outfit in both the game and this movie. The film also includes Ada's climbing pistol and her interactive sunglasses from that game.
This is the first time in Resident Evil history that Jill and Leon have ever met. Canon or otherwise.
Las Plagas is a parasite in the video games (first seen in Resident Evil 4 (2005)) that takes behavioral control of the host it infects. The infected humans do not become zombies and retain their normal appearance. However, its depiction in the film is different, since in the games it doesn't typically grant immunity to injuries. There is one exception though, a type of enemy called the Regenerador that has multiple parasites implanted; it can quickly heal and regenerate, but it looks only vaguely human in the games.
The original plan of Paul W.S. Anderson was to film this movie simultaneously with the upcoming sixth installment in the series, making essentially a two part finale. In the early stages of development Ali Larter and Wentworth Miller were slated to be included in the cast list. When the studio backed out of the concerted filming for two movies, Claire and Chris Redfield were scrapped from the production plans and the filmmakers made it clear that _Resident Evil Retribution_ would be a standalone film. The only carryover from the initial conception is the tagline which bills the 5th film as the beginning of the end.
In the scene that takes place in the Oval Office, the Great Seal of the United States on the ground is modified so that the eagle's head faces its left foot, which is holding 13 arrows (symbolizing war), as opposed to its normal pose where it faces its right foot holding an olive branch (symbolizing peace).
(at around 51 mins) In what may be an intended pun, a licker crashes into a liquor store in the Moscow simulation.
Although Carlos Olivera has a major role in the plot, Oded Fehr's name is curiously absent from the opening titles.
Jensen Ackles was considered for the role of Leon S. Kennedy, but the role later went to Johann Urb.
(at around 12 mins) Suburbia is actually Raccoon City as evidenced by a brief shot of a crashed helicopter. The helicopter belonged to the local news station.
Despite the fact that it is one of the first scenes in the film, Alice's fall in the water was one of the last sequences to be filmed. There was an extra shot of Jill Valentine and Umbrella soldiers pulling Alice out of the water which was cut in the editing process.
The idea of using environmental simulations references the 4th game based novel Resident Evil Underworld, where there were 4 environmental simulations; a forest, a desert, a mountain, and a city.
Every other Resident Evil film had a different composer for the soundtrack. This is however the first time that the music was written by the same people in two consecutive films. tomandandy (a duo of composers) scored Resident Evil: Afterlife (2010) and returned to write the soundtrack for this film as well.
Unlike the films, Barry and Leon are not partners in crime. Barry and Leon have not appeared together in any canon-games. Barry is a very close friend to the Redfield family (Chris and Claire especially). He appears alongside Chris in Resident Evil (1996) and Claire in Baiohazâdo reberêshonzu 2 (2015). It is possible he knows Leon in the games through Claire (Claire and Leon both debut in Resident Evil 2 (1998)). Chris and Leon know each other through Claire Redfield, however they first appear together in Resident Evil 6 (2012) where the two already know each other.
There are 3 scenes from Resident Evil: Afterlife (2010) that were reused in this movie: 1. J-pop girl attacking Japanese businessman 2. The scene showing A serum flowing through Alice's veins 3. The Ospreys approaching the Arcadia to attack.
Leon and Ada are the only Resident Evil couple to debut together and have their romance hinted in the films. Nearly all Resident Evil games features a heterosexual couple with romantic hints. Resident Evil Zero (2002) - Billy Cohen and Rebecca Chambers (neither have appeared in the films) Resident Evil (1996) - Chris Redfield and Jill Valentine (both have appeared in the films, have not met until off screen at the end of Resident Evil: Afterlife (2010)) Resident Evil 2 (1998) - Leon S.Kenedy and Ada Wong Resident Evil 3: Nemesis (1999) - none (Carlos Olivera hints an attraction to Jill Valentine, however in the films he is the love interest of Alice) Resident Evil: Code: Veronica (2000) - Claire Redfield and Steve Burnside (Steve does not appear in the films) Resident Evil 4 (2005) - Leon S.Kenedy and Ada Wong Resident Evil 5 (2009) - Chris Redfield and Jill Valentine, Albert Wesker and Excella Gionne, Josh Stone and Sheva Alomar (the latter three never appear in the films) Resident Evil 6 (Commercial) (2012) - Jake Muller and Sherry Birkin (neither appear in the films though Angela Ashford replaces the latter in Resident Evil: Apocalypse (2004))
Alice and Becky and especially the scene which Alice frees Becky from a cocoon was written as an obvious nod to Aliens (1986), mostly the characters of Ripley and Newt and the scene which Ripley frees Newt from a cocoon in the confrontation with the Alien Queen.
Is the only film in the series to feature characters Leon S. Kennedy, Barry Burton, Ada Wong, and Becky. Except for the latter, all of these characters appeared in the video games. The name Becky could be a reference to Rebecca Chambers (nicknamed Becky by fans of the games), a character that featured in Resident Evil Zero (2002) and Resident Evil (2002) but never in any of the movies.
According to the script, the chronology of the film's events allegedly take place some weeks after the end of Resident Evil: Afterlife (2010).