Corrected entry: When Silk Spectre gets teleported to Mars to meet with Dr. Manhattan, she struggles to breathe in the Martian atmosphere until Dr. Manhattan creates an "oxygen bubble" around them. A person on Mars completely exposed like that would die a most horrid death within seconds, their blood literally boiling almost instantly. And yet Silk Spectre is totally fine after the oxygen bubble is placed around her.
Corrected entry: In the opening credits sequence when Silk Spectre I is having an argument with her husband, she says, "I was a hero G*******t!" When she says this, her hands are in front of her. However, in both flashback scenes later in the movie, when she says that line her hands are at her side.
Corrected entry: Although the "alternate reality" excuse could be applied, shown in the film are HD (high density) 3.5" floppy disks (in Veidt's office) which did not exist until 1987, and on the set of the TV interview with Dr. Manhattan there is a Sony Profeel Pro series TV monitor (KX-27HV1?) which were not introduced until 1986.
Corrected entry: During the course of the movie, Archie the owl ship seems to change size. Most of the movie it is barely big enough for two people, however in the scene during the building fire rescue, 20 people are taken to safety in one transport.
Corrected entry: During the prison riot scene, one of the inmates, topless, is set on fire. The fire-proof/retardant "gel" is visible, applied all over his upper torso.
Corrected entry: At the beginning of the funeral scene, when the hearse arrives, there are three people visible on the right side of the screen. However, when the viewer observes these people during the shot inside the hearse as the coffin is removed, another person is visible with them: Rorschach, holding a "The End is Nigh" sign.
Corrected entry: Dr. Manhattan perceives time simultaneously across past and future yet is subject to Veidt's use of tachyon interference. Yet Dr. Manhattan would still be able to perceive the point at which he is told about the tachyon interference and the reasons for Veidt's plan. So really he would know all along anyway.
Corrected entry: When the bomb goes off in New York, the prison psychiatrist is knocking with his fingers at his stopped wirstwatch. He'd need his right hand for this. However, a few shots later we see that he is holding his briefcase in his right hand, so he could not have manipulated his watch with those fingers.