On the April 25th airing of SBS' 'Access! Movie World', Soo Hyun (Claudia Kim) talked about how it was on the set of 'The Avengers: Age of Ultron' as well as a small mistake regarding the set design.

Soo Hyun said, "In my first scene in the movie I speak in Korean. But no one in the staff of 'Avengers 2' knew Korean, so if I made an NG, I had to report on myself no matter what. It was always a little embarrassing," she said as she laughed.

She continued, "Then one day, Hawkeye (Jeremy Renner) was listening to me speak Korean in my lines, and he said, 'You made a mistake just now, didn't you?' I was very surprised at the time."

MC Ho Ran mentioned, "There was a small flaw [in the film]. In the Korean subway car scene, there were two-seaters. I questioned whether it was our country's subway."

Soo Hyun added, "If they asked me, there wouldn't have been such a problem."

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As you can see in the photo below, the green scene shows the subway car was created for the film (and not filmed on location), and the makers of 'Avengers' probably didn't know what a Korean subway looked like!