When Ann points her rifle at an intruder, who turns out to be J.R. Ewing, J.R. casually replies, "Bullets don't seem to have much of an effect on me, darlin." This is a sly reference to the famous "Who Shot J.R.?" storyline in seasons 3 and 4 of the original series. In this storyline, J.R. is shot but (obviously) survives.