Lynette bribes an elite prep school with $15,000 so that her son can attend. In real life, Felicity Huffman would later be charged with fraud for falsifying her daughter's SAT scores, also for $15,000.
The episode title "Come In, Stranger" comes from the Johnny Cash song of the same name.
Susan keeps saying Mike is giving mixed signals or being distant. In the previous episode, she gave her date to Edie b/c of Julie retrieving something out of her house and not getting caught.