Freddie complains, "I'm Lord Munster, not HIM!" Lady Effigie explains that Freddie should have used the pronoun HE because "the objective pronoun always takes the nominative case". While she is right that Freddie should have used the pronoun HE, her explanation should have been, "When the predicate pronoun refers to the subject, the pronoun takes the nominative case". In fact, most pronouns in the predicate of a sentence are in the objective case, not the nominative case.
When Grandpa is trying to get Herman to take the "sea-sick" pill, he is wearing gloves. When he himself takes the wolf pill by mistake, his left hand starts to change and he is no longer wearing a glove on that hand, but is still wearing a glove on the right hand.
It is mentioned that Freddie Munster's father disowned him so the title "Lord Munster" would pass to Herman. In English peerage, a title passes onto the next in line of succession regardless of the previous holder's wishes. Only an Act of Parliament may remove an heir. Freddie's father could leave all the money and land to Herman, but the title would go to Freddie.
Towards the end of the film, as Herman is racing towards the oil slick near the finish line, the Drag-U-La car begins to spin out before the car ever reaches the oil slick. By the time the car reaches the oil, it is already sideways and the rear wheels hitting it are used to propel oil into the air.