Goofs

After Tanner is fired he is walking the streets. When he's looking at toy soldiers in a store window, his hair is "boyishly" sown over his forehead. Then he sees the "Don't Run" sign and a close-up shows him with his hair neatly combed and very shiny with product in it. As he walks away from that corner, his hair is once more not slicked and down over his forehead.

The initial establishing shot of the movie shows a low shot of a building complex, including a guarded entrance. A matte shot of several buildings is shown straight ahead in the distance. After a shot of the guard checking Michael Rennie's ID, the car moves forward, showing nothing in the distance. Though the same area in the distance is shown, the buildings have disappeared.

When Tanner is walking in desert, he throws his tie away. Later, when he visits Mrs. Hallson, he is wearing the same tie.

After Professor Melnicker places the paper on the pencil in the book for the experiment, the paper moves down on said pencil without being touched in subsequent shots.

At 1:02, during the fight, something spills on the electric stove, causing a brief flame. But seconds later when he burns his hand on the burner, the burner is clean.

In the Joshua Tavern, reflection of the camera crew walking around can be seen in the jukebox glass.

Something falls off the hood of Bruce's Jeep while waiting for Tanner at Hallson's desert home. It can clearly be seen and heard.

Although the story in this 1968 film is supposed to be taking place "tomorrow" the magazine rack in the hotel displays two identifiable magazines from 1966.

During Tanner's high speed jeep ride into the desert the tires squeal even though they're traveling on sand.

When they are at the party, Margery turns on the turntable and the needle moves up, but the music starts playing before the needle drops on to the record.

For a brilliant scientist, Jim Tanner stinks at logic. After establishing that the mysterious Adam Hart was one of the six other people at the committee meeting and was a contemporary of Professor Hallson, Jim fails to deduce that Adam Hart had to be one of the only two people at the meeting who were of the correct age. Even worse, he wastes time chasing all the people that were too young to be Adam Hart before realizing the truth.