Robin Williams and Billy Crystal were not allowed to be on the set at the same time during filming, for fear they would crack up the cast and crew, and cause major production delays.
Kate Winslet (Ophelia) learned on the day that she had to shoot the straitjacket scene that she had just been given the role of Rose in Titanic (1997).
The first full-length movie version of Hamlet ever made (using the Second Quarto (1604) text with additions from the First Folio (1623) to create an idealized "complete" Hamlet).
Writer and director Sir Kenneth Branagh's decision to shoot in 65mm was largely inspired by a film format seminar conducted by visual consultant Rob Hummel. Hummel convinced him to use the format because of high-resolution and certain shots could only be achieved in 65mm. Also, Branagh once said that the intention was to give a sweeping feel to the play, hearkening back to the 1960s epics like Lawrence d'Arabia (1962).