Stephenie MeyerStephenie Meyer handpicked [?] Carolina Herrera to design Bella's wedding dress. Herrera was pleased when Kristen StewartKristen Stewart loved the dress because her ultimate goal was to please the bride. Costume designer [?] Michael Wilkinson worked closely with Ashley GreeneAshley Greene to design Alice's dress worn at the wedding. They decided on a flapper-like dress to reflect her native time period of the 1920s. Wilkinson also worked closely with Nikki ReedNikki Reed to create Rosalie's dress.
Robert PattinsonRobert Pattinson took a boat driving lesson so he would be able to drive the boat in the honeymoon scenes. Despite taking lessons, he crashed the boat in both the lessons and while filming in Brazil.
Takes place in a period of one full month. The Twilight character guide points out that Renesmee's birthday is 11 September, thus at the film's cliffhanger scene, it takes place the next morning (12 September).