 When Mongo gets his gumdrop button knocked off while attacking the  castle he lets out a scream. The scream is that of Godzilla from  films such as _Mosura tai Gojira (1964)_ (qv),  _Gojira tai Mekagojira (1974)_ (qv), and more recently the 1998  remake _Godzilla (1998)_ (qv).