Ashton Kutcher is a nerd with technology.

'Jobs' director, Joshua Michael Stern told Wall Street Journal: "He knew everything there was to know about everything that was going on, even historically, about the technology we used. I walked onto a set once and there was a computer processor that was there as set dressing and he removed it and said, 'This wasn't invented for two more years."

Meanwhile, Ashton admitted audiences may be apprehensive about his interpretation of the icon.

He told Wall Street Journal: "People are probably going to watch and in some ways feel there are things I didn't nail. There's a lot of different perspectives on the guy."

Ashton ended up in hospital after he tried the entrepreneur's fruitarian diet, but said he just wants to do the role justice.

He told The Hollywood Reporter: "I felt a huge responsibility to channel him to the best of my ability and tell the story honestly and accurately without glorifying or shaming him,"

Ashton is an investor in Airbnb, Uber and Spotify and is a well-known promoter of modern technology. He famously beat CNN to one million followers on Twitter.