At the end when Rose is trying to wake up Jack we see that Jack has ice under his nose but when the camerea cuts to Rose you see Jack's nose and you see no ice.
Recorded temperature that night was 28 degrees, or just 4 degrees below freezing. It's not likely that any object, much less a live body, would have any ice on it whatsoever. The ship's railings and other structures exposed on all sides would have had ice on them, as well as the 'raft' on which Rose is floating, yet there is none. Additionally, salt water has a slightly lower freezing point than does fresh.
One of the best ways to form ice is repeated exposure to warm, humidified air in a cold enviornment. Ice would form around mouths because of breath freezing. On really cold days here in Colorado dad sometimes had to break ice of his mustache.
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