Bill puts up the top of the Buick convertible and heads into the house as the downpour starts, not rolling up the car windows. Moments later, when he and Connie go out into the downpour to see the newly-drilled well, all the car's windows are closed.
When Bill drives through the woods the first time to get to the house, the mop that occasionally obscures his view, appears and disappears from shot to shot.
When Bill is shaving in the apartment, the amount and location of shave cream on his face changes before, during, and after the couple viewing the apartment comes and goes.
When Bill is coming in with an armload of stuff from the car to the house, the position of the suitcase on top changes between shots several times before he drops the whole pile.
At the end when Bill and Connie drop into a hole in the ground, if the film is paused about two seconds before they fall and then run in Super Slo-Mo, the faces of the stand-in actors who took the fall can be seen.
Per IMDb guidelines, this is an "Unacceptable Goof" as it is a "Blink and you'll miss it: If it's "easily missed" or you have to "view the scene frame-by-frame" then it's not a goof."
Per IMDb guidelines, this is an "Unacceptable Goof" as it is a "Blink and you'll miss it: If it's "easily missed" or you have to "view the scene frame-by-frame" then it's not a goof."
When Bill is putting up the roof on his convertible during the first rain storm at the new/old house, he forgets to put up his windows.