I'm not sure exactly what you're asking since you say the example is only pulling one feed, but you're only supplying one feed address. So I am assuming you're looking for one of two things:
Option 1: The API is not displaying all of the entries from the feed you provided
Considering that all three of the entries on your feed are dated the same, I don't understand why it's not displaying all of the entries. However, if you add the following line after var feed = new google.feeds.Feed(...); it will pull all of the entries from your feed.
feed.includeHistoricalEntries();
Option 2: You're trying to display multiple feeds with the same example
Jeremy R. Geerdes
Generally Cool Guy
Des Moines, IA
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