When Marsha and Doug Simpson are on the hill in the car and he tries to make out with her and she tells him she is not that type of girl, her nose is back to normal, although it was clearly squashed before that scene and all the scenes following.
Mike drags Carol's needlepoint to his side of the bed (the right side), but when Cindy interrupts what Mike and Carol are doing, the needlepoint is on the left side of the bed where Carol originally was.
The position of the Greg's guitar strap keeps alternating between being under and over his collar when he's playing for Cindy. The same thing happens moments later when he's playing while watching himself in the mirror.
When Cindy Brady delivers the Dittmeyer's mail, Larry Dittmeyer is running on his treadmill. The Bloody Mary, in the drink holder, has no celery stick in the glass but, in a following close-up, a celery stick appears in the drink from nowhere.
Mr. Dittmeyer is looking through the driver's side rear view mirror while talking on the car phone. The mirror shows that "objects are closer than they appear" just before Jan knocks off the mirror riding her bicycle. This warning is only on the passenger mirror.
While walking on his treadmill, Mr Ditmeyer's tomato juice glass is being jarred quite a bit, yet does not fall. After getting off the treadmill to get the Brady's mail, the mere movement of the still-running treadmill belt is enough to make the glass slide off, spilling the juice on the belt indicating the glass was anchored to the console initially.