Revealing mistake: While Wayne, Diane, Patty, and Gordon are in the laundry basket, Adam and Mitch carry that basket upstairs. When Mitch says, "I bet my parents wish I didn't have a medical problem," the camera turns to follow the boys as they walk up the stairs, and the left wall (with striped wallpaper) of the staircase is missing to accommodate the camera filming from that angle. It's visible again when Mitch says, "And I feel fine." (00:35:35)
Revealing mistake: While Patti and Diane talk next to the spider, in the close-up shot, the web becomes a thick white rope that has nothing to do with what we see in the wide angles.
Revealing mistake: When the boys take the laundry basket upstairs, there's a shot from in front, and one can see none of the four family members is inside. The filmmakers didn't even bother to place toy figures inside.
Revealing mistake: When Diane and Patti chat next to the spider, Patti stretches out her arm to move the (blue-screened) spider web away, but she is missing the spot by two metres.
Suggested correction: No, Patti is not meant to be moving the spider web away in that shot; she is simply reaching for the web so she can cut it with the nail file and free the daddy longlegs. Then, the shot changes before we see her touch it. After two shots of Patti off-screen, we then see her cutting the web. Plus, that screenshot does not convey the "problem."
Revealing mistake: After the toy car crashes, the group falls down a hole, but their clothes don't react to gravity, revealing the green screen trick.
Revealing mistake: When the group is riding the toy car, in the wide shots of a real toy car, they disappear.
