When Isaac Newton is at the house he said he took some good natured ribbing before he left the boarding house. While at the party he said he stored the band candy in his garage and that his mother didn't allow him to have a phone until last year. This was just all mixed up.
When writing the letters from Isaac Newton, Blanch and Dorothy said he was a citrus farmer. Later when at the dance, Isaac tells Rose he works at a high school and she never questions it.