A member of the public mistook Hopkins to be a homeless man while the actor was working on a new modern-day version of the Shakespeare play while filming on-location in Stevenage, reports digitalspy.com.
"When we were filming there, a woman in a mobility scooter rode up to Tony, and said, 'You know, there's a hostel up the road... so you might want to take your shopping trolley down there'," Eyre told the audience following a screening of the film.
Hopkins, who starred in HBO series "Westworld", has been developing this version of the play alongside Eyre for years.
"Sherlock" star Scott - who plays Edgar - commended Hopkins' work ethic, saying: "What I found so extraordinary about him was how ferocious he is about being an actor. He'd come in every day and you'd say, 'How did you sleep?' and he'd say, 'F*** sleep, I didn't sleep'."
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