When Phil talks to Gloria about how long it took Jay to accept him he says that "by that time Mitchell had brought Cam home". Given the time frame established in the pilot that means Phil and Claire had been married for 11 years before Jay accepted him.
The introduction of the "double question" which has become a mainstay device throughout the series. Cam asks, after Mitchell says Cam loved scrap booking, "Did I Mitchell? Did I?" Mitch even calls it out, responding "Don't do the 'double question to prove a point' thing."
Haley is the only one besides the infant Lily to not enter the pool.
The episode is titled after the phrase "gold digger".