“Last week, Steven Soderbergh – retired from filmmaking, but still with many tricks up his sleeve – posted, on his Web site, a feature-length mashup version of Psycho that splices together the Hitchcock classic and Gus Van Sant’s shot-by-shot remake. … At the film’s violent junctures, … Soderbergh overlays the two versions, creating a disorienting blur of Hitchcock’s horror and its latter-day identical twin. (includes video excerpt)