McKay credited Rudd, who plays Scott Lang in the film, for improvising the script written by departing director Edgar Wright, reported Aceshowbiz.
"I've always known Paul Rudd's a really good writer from improvising with him on set, but I had no idea he was that good. He's really great with dialogue," McKay said.
"I think it was like six to eight weeks we just ground it out and did a giant rewrite of the script. I was really proud of what we did, I really thought we put some amazing stuff in there and built on an already strong script from Edgar Wright and sort of just enhanced some stuff," he added.
"I grew up on Marvel Comics so the geek in me was in heaven that I got to add a giant action sequence to the movie, I was so excited. So we did, we added some cool new action. There's a lot that's already in there from what Edgar did.
"We just shaped the whole thing, we just tried to streamline it, make it cleaner, make it a little bigger, a little more aggressive, make it funnier in places, we just basically did a rewrite. Edgar had a really good script. Rudd was just so much fun to write with. I walked away saying, 'Hey, you and I gotta write a script together,'" the writer said.
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