Audio problem: When the professor is walking out toward the car after Bobby yells at his house, Bobby says, "You're joking with me," but if you watch his mouth, you can tell that he really said, "You're f - -ing with me." The original line was probably cut during editing to keep the PG-13 rating, but it's still a problem.
Audio problem: When Marvin throws Bobby's coin collection at him, Bobby yells, "Thank you, Marvin." but if you watch his mouth you can tell the original line was, "F - - you, Marvin." It was probably changed in order to keep the PG-13 rating.