In the movie, Mikey wants to be an only child (and, like in the book, he is an ordinary child, unlike Matilda). Michael's nickname for Matilda is actually "dip face." In the book, Mikey leaves his little sister alone, and at the end he waves goodbye to Matilda (while in the film, Zinnia is the one who waves goodbye and says "Ciao" while smiling as he stares dumbly at her). In both the movie and book he was educated by his father, as he is to inherit the used car dealing business in the future; however, in the movie, Harry was more into showing Mikey some details, and Mikey developed an interest and fascination in the business.
In the movie, Mikey bullies Matilda, and his nickname for her is "Dip face". Mikey wants to be an only child. Mikey is an ordinary child unlike Matilda.
Michael bullies Matilda, and his nickname for her is "Dip face". He wants to be an only child. Matilda also has telekinetic powers and superhuman intelligence, unlike her brother.