Unfortunately, I can't offer anything specific to that video.
But I can say that many of Derren's tricks are combinations of forces, multiple tries (how many ad execs participated?), compliant participants, and my favorite "dual realities". Dual realities are when a magician's words have different meanings, depending on how people have been prepped. And with video, you don't know what sort of direct priming he cut out.
In general, I've come to believe that the explanations he offers are NEVER the real mechanism for the trick. The pseudo-explanation. The wonderment that the given explanation might possibly work just adds to the trick.
But I can say that many of Derren's tricks are combinations of forces, multiple tries (how many ad execs participated?), compliant participants, and my favorite "dual realities". Dual realities are when a magician's words have different meanings, depending on how people have been prepped. And with video, you don't know what sort of direct priming he cut out.
In general, I've come to believe that the explanations he offers are NEVER the real mechanism for the trick. The pseudo-explanation. The wonderment that the given explanation might possibly work just adds to the trick.