If Jack edited footage of himself taking his own dick out of his pants and tucking it back in before walking out of frame, it would include 138 jump cuts, the hands on any clock visible in the background would advance five and a half hours, frames could be compared to prove that he is wearing three different pairs of pants over the course of the clip, and you wouldn't actually see him replace his dick or walk - It would cut to him sitting on his couch, asserting that he had performed both actions, with a coat draped over his lap.