 Little to no actual dialogue for the Gremlins and Mogwai exists in  the script in itself. In addition to several instances of on stage  rewrites changing or adding to much of the script, the voiceovers  were all mostly ad libs, repeating snippets of just performed  dialogue or in reaction to other sound effects or environment. To  this end, Howie Mandel (I) (qv) recorded Gizmos lines  phonetically for foreign dubs of the movie, where localized dialogue  and in jokes helped make the picture successful with audiences world  wide.