Character Analysis
Lewis works with Lovett in this quest for the Heart of the Ocean. He's a funny guy who likes to keep things light, but his sense of humor can make him come off as a little crass.
Or a lot crass.
For example, when he's reviewing the events surrounding Titanic's sinking with Rose, he's pretty glib and adds a lot of unnecessary sound effects for flourish (and potentially humor), and caps off the narrative with
LEWIS: Pretty cool, huh?
…which isn't the most sensitive thing to do in general, but certainly not when you're talking to a survivor of the tragedy you're describing.
However, like Lovett and basically everyone else who hears Rose's story, Lewis seems a little more sensitive at the end of the film.