 FACT: When Tyler splices porno frames into family films, the audio  track would have only a barely noticeable 1/24 second interruption  (as shown) and would stay in sync. However, the flash and sound are  shown simultaneously, when in fact, if they were on the same frame,  they would be about 3/4 seconds apart. The sound for a 35mm film is  read by a head located about a foot past the projection lamp, so the  soundtrack for a given frame is also located about a foot past the  frame. (Incidentally, the splice is not necessarily at a changeover  point; those are discussed only to explain why a projectionist must  be present.)