Some of the sound effects/vocal effects by Warner Bros. Animation used came from the classic MGM Tom & Jerry shorts of the 40s & 50s.
Mark Watter's musical scores also tend to be much closer to Scott Bradley's in the film.
CASTLE THUNDER: During the storm in the opening credits, also heard in speeded-up and slowed-down variations. This is somewhat ironic, as while this film makes heavy use of the classic MGM sound effects, the old Tom & Jerry cartoons did NOT use the Castle Thunder sound effect.