When the giant chicken is bursting out of the chicken house, it's seen in the back of the chicken house instead of through the roof.
When the gang and Mrs. Frickert were talking to the rock businessmen, they were dripping with water. But in the next scene, they are immediately dry.
At one point, Fred is missing his eyebrows.
When Shaggy makes his joke about the rock festival, his laugh is actually Daphne's laugh.
The scarecrow doesn't dive into a pile of hay as Velma stated.
Shaggy refers to Mrs. Frickert as 'he' at one point. The actor Jonathan Winters is male, but the character is female.