Steven Culp (the father of one of the two girls in the car crash) also played the role of Rex Van De Camp in Desperate Housewives (2004).
When Geoffrey Arend (Ethan Gross) speaks Spanish, Nic Bishop (Peter Dunlop) told him that Nathalie Kelley (Dani) does not speak Spanish. Ethan then asks if she's Portuguese. Nathalie has indeed learned Portuguese when she spent summers in Brazil.