It's a Cartoon World

It's a Cartoon World is a 1954 American live action/animated comedy film produced by Universal and directed by John Darkvall.

Synopsis
1954, Mischievious but kind hearted 5th grader Grant Lepetit has an essay to write on animated films (especially Disney's) given by his cranky teacher Ms. McGraw as Grand never watched cartoons in his life. After dissing his 3 years old little brother, Grant wakes up in a world full of animated characters where he mets animated characters/puppets/plushes and the girl of his dreams...

Cast/Voice Cast

 * Bobby Discroll as Grant Lepetit, the main hero who wakes up in the Cartoon Dimention
 * Kathryn Beaumont as Harriet, a girl of Grant's age trapped in the Cartoon Dimention who has a crush on him
 * Eleanor Audley as Ms.McGraw, Grant's teacher
 * Walter Catlett as the voice of the talking Ford T Model
 * Charles Judels as the voice of Harriet's epron who has a strong dislike for Grant
 * Mel Blanc as the voice of Grant's assignement paper/Harriet's plushies
 * Verna Felton as the voice of Bibidi, a sentient magic wand