Brainstorm (1983) - 5 mistakes

Continuity: When Alex is trying out the device for the first time car 6 is in front of him but that is the car he is supposed to be in - it's the car that Gordy drove when collecting the data.

Continuity: As Alex is congratulating Mike and Lillian and saying the department heads need to be told, Lillian lights a cigarette. The camera switches to Alex, who says one sentence, then back to Lillian and the cigarette is almost gone.

Continuity: When Christopher Walken gives his wife a tape of his best memories, many of the shots are 3rd-person, of the two of them, and not 1st-person, from his perspective, like everyone else's recordings.

Continuity: As Mike and Karen walk the aisle at Lillian's funeral, she links her arm with his. The camera cuts to a wider angle and they're not touching.

Plot hole: The demonstration to the Board of the system's potential is ported through acoustic modems. Even in those days (early 1980s), anyone would have realized that the bandwidth simply wasn't possible at 300 bps.