At a Q&A session after a screening of the film, James Corden recalled an incident during rehearsals in which Meryl Streep jumped on a table and her foot got caught in her costume. She started falling backwards, head first, toward a concrete floor. Both Corden and director Rob Marshall froze in the fear that they were about to witness the death of Meryl Streep. However, a pregnant Emily Blunt stepped in and caught Streep before she hit the floor.
According to Anna Kendrick, the set pieces used for the woods were so big and realistic that she and Chris Pine actually got lost while on the sound stage, and had to be rescued by a production assistant.
According to Anna Kendrick, Chris Pine was extremely shy about his singing voice, and noted that he would hold back during rehearsals. She only heard his actual singing voice when she was eating lunch in the recording studio. She was in a room by herself and she heard a "beautiful, crooning voice" coming from the hallway, but she assumed that it was a singer from a different project, since multiple records were being recorded in the studio. She then noticed that the singing wasn't stopping, so she poked her head out to see who it was. To her surprise, she discovered that it was Pine, who didn't know anybody else was there.
Meryl Streep revealed that after turning forty, she was offered three witch roles in one year, and she implemented a 'no witches' rule. She ended up breaking that rule after meeting composer and lyricist Stephen Sondheim and Rob Marshall for this film.
Emily Blunt revealed that the "Any Moment" sequence was rehearsed when she was about three months pregnant, and it was filmed when she was about seven months pregnant. The change showed during filming, as Blunt noted that during the scene, Chris Pine dips her during a dance, and that Pine's arms were shaking due to the change in weight.