Factual error: Reel-to-reel tape recorders were threaded left-to-right and pulled the tape in a L-R direction. The machine playing Briggs' assignment in the opening sequence, however, is running backwards. It also changes to a different reel and a different machine when he removes the finished tape from the wrong side of the recorder. (00:02:00)Jean G
Continuity mistake: Phelps takes the tape from the recorder's right-hand spindle. When he opens the acid vat, we can see the tape he just removed back on the recorder - but on the left spindle. The tape he then drops into the acid doesn't remotely resemble the one he pulled, and when he drops it, the recorder's left spindle, where the full tape was in the last shot and where the empty reel should be, now has nothing on it at all. (00:02:50)Jean G
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