This is the episode where Miss Crabtree crashes the bus and leaves the children stranded, and the boys reminisce about "sticky situations". In the episode Miss Crabtree is discovered as a comedienne and appears on the Jay Leno Show. There was a man she goes round with throughout the episode. After the show she calls him Mitch, but for the rest of the episode she calls him Marcus. I can't think of any logical explanation as to why that should be.