The T-shirt Alex is wearing says "And God said let there be [a series of equations] and there was light". The equations are Maxwell's equations which describe electromagnetic radiation, one manifestation of which is light.
Claire claims that she is only 14 months older than Gloria. In reality, Julie Bowen is 2 years and 4 months older than Sophia Vergara.
Phil fixes Jay's printer in The Kiss (2010); in the montage where Jay recounts the times that Phil has bragged about doing so, he recalls them helping Luke and Manny fix their ties for the school dance in Dance Dance Revelation (2010) and him and Phil on horseback at the dude ranch in Dude Ranch (2011).