Not real a goof, but when the teacher said. "Het is grappig. Begrijp je. Vertel hen: 'Het is grappig.'" I could not understand what she said and I am Dutch. Sounded like she put the words through a meat grinder. Sydney said it a bit better. Like I said more of a comment than a goof.
The person sounding Dutch was the girl in the classroom answering in English! The teacher really messed the pronunciation up, and yes, Sydney did a bit better.