Continuity mistake: During the outdoor scene from Manny's surprise party, Phil is chomping away on corn on the cob like a madman. When he gets up, he wipes his mouth with his napkin while leaving some corn on his face. Claire jumps up and tells Phil that "they have a gardener", and the corn is still there. However, as he turns around with Claire by his side, the corn disappears.
Revealing mistake: In the scene where Claire catches Alex and Skyler about to shave each other's hair, Claire grabs the shaver and waves it around, and the shaver gets caught in Skyler's hair. The color of the hair caught in the shaver (black) is different from Skyler's hair color (very dark brown). It is quite close, but still significantly different.