When does a comma follow an exclamatory 'oh' or 'ah'?
Example 1 (no comma after oh)
“Everybody can't come here, you know, how ridiculous can you get? There's just barely enough room on this planter box for you and me, and not much else! Oh you're crazy all right, Marshall, no doubt about it!” “Probably. You know though, we […].”
(The Cosmic Lady Was Right: An American Journey by Marshall Motz)
Example 2 (comma placed after oh)
“Oh, my gosh,” Ronald cried out. “You destroyed my ship, what are you doing?”
(Monster Closet by G. L. Robins)
Is this only a matter of style, or are the uses of 'Oh' in the examples above somewhat different?