The humans were killed rather crudely by slitting their throats with a big alien knife. Presumably the replicants did that - so why don't they remember doing *that* and know who/what they are? I liked the movie a lot, and enjoyed it immensely, but after the fact...a lot of plot holes become apparent the more I think about it
Yeah I kinda wondered about that too. Unless there was some sort of memory switch that triggered when they killed the real Olhams; I can't see how the impostors would simply "forget" what happened.
-------- The movie has a plot hole?!? EVERY FRIGGIN' MOVIE HAS A FRIGGIN' PLOT HOLE!!!!!