Deliberate "mistake": When "Roy" is punched in the water by Mr. Brady at the end, when "Roy" hits his head comes up and it is obviously not Tim Matheson.

Continuity: During the opening credits, Greg comes down the stairs in his disco clothes, he has no necklaces on but a second later when he starts talking to Mike Brady, he now has two necklaces on.

Revealing: In Hawaii, when Roy throws the little statue, you can see the thread which guides it to the spider.

Continuity: In the scene where Jan Brady is talking to Cindy and Peter in the bathroom, she is holding her contact lens. Then in the next shot she is wiping her face with a lemon, and in the very next shot the lemon has magically changed into a blue towel that she is wiping her face with.

Revealing: In the scene where Marcia and Greg are building a house of cards to see who gets the attic, they keep breathing deeply and blowing air out. This reveals that the house of cards is obviously glued together.

Visible crew/equipment: When Roy is driving to Dr. Whitehead's place with the horse a camera reflection is visible just under the windscreen throughout the scene.

Continuity: When Marcia and Gregg are making a playing card castle and Peter throws a ball, you see Jan walking in the corridor, then she has disappeared and you see her again near the horse statue.

Continuity: Near the beginning of the movie when Mike Brady is in the kitchen talking to Alice, the amount of carrots in the steel container on the countertop changes from shot to shot.

Continuity: In the scene where Jan phones her 'boyfriend' George Glass, she has a yellow piece of paper with her which says 555-HUNK on it. When she is dialing on her rotary dial phone, at first the camera is on Jan, and the noise of her putting the first 4 numbers into the rotary phone does not match up to the movements of her arm. Then the camera closes in on the phone, and she dials 221, instead of 865 or 'UNK', for the last three letters of HUNK. Still, she gets the right place she was trying to call.

Continuity: When Greg is surfing he accidentally falls into the water, at least 50 metres from the shore. About 5 seconds later, Greg is lying perfectly on his back on the shore, unconscious. There is no way that he can he swim 50 metres in 5 seconds while being unconscious.

Continuity: When Jan talks to her family about George, her invented boyfriend, the amount of orange juice in Greg's glass change between shots.