If the surprise expressed by
James Cagney's fellow inmates during "the telephone game" scene in the prison dining room appears real, it's because it is. Director
Raoul Walsh didn't tell the rest of the cast what was about to happen, so Cagney's outburst caught them by surprise. In fact, Walsh himself didn't know what Cagney had planned; the scene as written wasn't working, and Cagney had an idea. He told Walsh to put the two biggest extras playing cons in the mess-hall next to him on the bench (he used their shoulders to boost himself onto the table) and to keep the cameras rolling no matter what.
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