The comedy from David Zucker has a silly, slapdash quality that lacks any real satirical bite, but there are some amusing moments. If "An American Carol" contained any real bite or intelligence, those so inclined could've legitimately griped about its shallow anti-liberalism. But given that this supremely silly satire directed by "The Naked Gun's" David Zucker (from a script he wrote with Myrna Sokoloff and Lewis Friedman) plays more like something slapped together to beat an expiration date, it's hard to get too worked up about it.