It suggests that Groucho believes the writer of the original letter knows as little about the city of Casa- blanca (his history is filled with absurd details) as he knows about how different the Marx Brothers' film A Night in Casablanca would be from the famous Casablanca.
Working with autistic children will be a lot different than working with atypical kids. Autistic children need more help and attention and love than normal children.
Oberon instructs Puck, his helper, to find a magic love potion and to give it to Lysander so as to make him fall in love with Hermia. However, Puck makes a mistake and because of it, both Lysander and Demetrius fall in love with Helena, which is not something Oberon wanted to happen.