Joss Whedon might have scored a veritable mega-hit with , but according to the director, he still could have improved upon its structure.

"When I think of a great film, I think of something that’s either structured so perfectly like or made so lovingly like ," says Whedon. "There was haphazardness in the way it comes together – not just the people, but the scenes.

"I don’t think you’d look at it and go, 'This is a model of perfect structure.' You’d go, 'This is working.' I like it. I’m proud of it and I like its imperfections. The thing I cared most about – making a summer movie like the ones from my childhood – is the thing that I pulled off."

As for what we can expect for round two, Whedon is planning to be even more meticulous this tine around…

"I want to be clearer about how I engage the audience, and where I take them," explains Whedon. "I want more control visually, more time to prep it.

"Not that I didn’t dictate every shot - I did. But there’s only so much you can do when you’re making a summer film when the ball is already rolling as fast as it was when I got in. Why do it again if you can’t do it better?"
will open in the UK on 1 May 2015.