The Legend of Frosty the Snowman is where they added Frosty teeth and a tongue.
Both Bill Fagerbakke and Tom Kenny are main cast members in SpongeBob SquarePants (1999), with Tom Kenny voicing SpongeBob and Bill Fagerbakke voicing his best friend Patrick.
The young Mr. Tinkerton's father greatly resembles Professor Hinkle from the original 1969 TV special.