Not sure if I want to upvote this and draw attention considering "a friend" of mine might want to use it in the future, but what the hell. Cool hack.
You got lucky. Every sane ticket-taking venue, especially in New York, scans the barcodes. I am rather surprised that that particular venue accepts a printed sheet of paper at its word.
Someone should forward this to the management of Regal Union, and get them to change their policy. They definitely don't scan, and I've been there 5 or 6 times, so I've observed this across high-traffic as well as low-traffic.