When Bobby and Cindy are playing checkers, Oliver is shown wearing a Cal. State Northridge t-shirt. But just before Arthur comes in, the words on his t-shirt are shown covered up with tape which matches the stripes on the sleeves.
For some inexplicable reason, Mike Brady disappears from the final scene which settles the plot (Mr. and Mrs. Brady coming home and catching Peter and his double) after the final commercial break.