There is no proof that Udham Singh ever used the name Ram Mohamed Singh Azad. Udham Singh used the name of Mohamed Singh Azad as one of his signatures on a letter to his friend Baba Bishan Singh of California.
However, the opening credits of the movie do state that the makers took "creative liberties" and dramatised the events for "cinematic expression", so some divergence from pure accuracy is to be expected.
However, the opening credits of the movie do state that the makers took "creative liberties" and dramatised the events for "cinematic expression", so some divergence from pure accuracy is to be expected.
At the time of Jallianwala Bagh massacre and in some other scenes, Udham Singh is shown to be wearing a Patka (Head Covering). From all the pictures available of that era, Sikh children as small as 5 year old use to wear Turbans and not Patkas which came into fashion quite late, mostly after India's Independence in 1947. For casual head coverings, Sikh children/men used to cover their heads with Parnas or Saafas which are slightly less formal covering than a Turban.
The machine-gun observed on top of the armored car does not resemble any WW1 era British machine gun type.
During the drunk "free speech" monologue Udham uses poet Majrooh Sultanpuri's infamous "Patta Patta Jaane, Boota boota jaane......" poetry from the 1972 Hindi film Ek Nazar, while the movie is set in pre-independence time (before 1947).
Udham Singh goes to Jallianwala Bagh at night after the shootout. The Bagh is almost lit up like a day. There is no way in 1919, there were so many lights in the Bagh. Even today, though there are lights at Jallianwala Bagh but not as bright as shown in the movie.
Udham Singh is taking wounded to a house and lady of the house says the have shut off water. Though it's not impossible but most households did not have running tap water at that time. Almost all households had handpumps for water so shutting off water supply wouldn't matter.