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.
Brainstorm (1983)
1 plot hole
Directed by: Douglas Trumbull
Starring: Christopher Walken, Cliff Robertson, Natalie Wood, Louise Fletcher
Continuity mistake: 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. (00:59:50)
Dr. Michael Anthony Brace: Why do you have to die to let go?
Trivia: It was because of Natalie Wood's (Karen Brace) untimely demise that the plot was rehashed at extreme variance to the original script, and to maintain continuity, Wood's sister was used as a body double. Also, the bodily "energy rejuvenation" experienced after playing the looped orgasm tape was supposed to be a major plot-point, not something shuffled off to the side.