I actually did not realize it until a few months ago when a patron here at the library asked about it. He couldn't think of the name Barbwire, just that it was Casablanca, in the future, with a blonde.
The more I think about it, the more I see the connections.
I think I failed to catch the resemblance because Bogart's Rick was much more subtle about the help he tried to provide.
Plus, Barbwire isn't a movie you really think much about as you watch it...if you get my meaning.