I hate to be a spoiler with my first Comment on this site (I promise I'll make a couple additions to make amends), but the line is in the script, not a goof, and it's "Hiya Johnny", directed at John Truett, Tom Drake's character.
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Melissa writes:
actually the what the person says is iya johhny it does sound like the person is saying hiya judy but he is not he is refering to Jonh Truit