Three of the Bradford children are loudly talking about "invading the Ukraine from Iceland" and "taking Kamchatka" as they play a board game. The dialogue is clearly referring to RISK, but the game they are seen playing is LIFE.
When Nicholas shuts off the main water valve, Joanie emerges from the bathroom where she had been showering covered in a towel and Tom comes from his own bathroom where he had been shaving. In closeups Joanie has shampoo in her hair and Tom has shaving cream over his whole beard, but in wide angle shots Joanie has no shampoo and Tom has far less shaving cream on his face.
Nicholas tells Joanie she violated section 3 of the water code by staying in the shower too long. Section 1 actually states there is a three minute limit on showering.
When Joanie confronts Nancy when she is searching through her clothes, the items on the dresser change positions between the wide and closeup camera shots.
Mary's old term paper is entitled An Examination Of Student Government but the actual content is line after line of gibberish.
When Susan and Abby discuss the events that occurred at dinner, Susan's version of what happened is wildly inaccurate.