Kangana Ranaut was admitted to the ICCU ward at Apollo Hospital Hyderabad after suffering a major injury during a fight scene; she got 15 stitches.
During a swordfight scene between Kangana Ranaut and Nihar Pandya, the timing went wrong and the sword hit between Kangana's eyebrows, grievously injuring her.
The action scene where Kangana Ranaut got injured she had decided to do herself, without a body double.
In the final phase of Manikarnika, Sonu Sood walked out from the film due to the busy schedule of Simmba (2018). Rumours went around saying that there is a fallout between Kangana Ranaut and Sonu. However, at the end of the day Mohd. Zeeshan Ayyub replaced Mr. Sood.
Richard Attenborough was planning to make the film in Hollywood with Hema Malini in 1991. Then years later Aishwarya Rai Bachchan was to do the film with another producer.