A weïrd dream with a recurring segment

I've had this recurring dream lately, and it's pretty much The Invasion of the Body Snatchers. People are trying to kill me and replace me with a creepier less personable counterpart.

Last night's version was much more interesting. I was visiting my parents with Sums, my fiancée, in Minnesota and we went to go get the train tickets. We go to get our train tickets to go back home to Chicago the next day, and I some how wind up in the train, though I'm not ticketed for that ride. So I get off at the next stop, and ride a very long winding escalator through the station, waving to Sums at her desk at work, when I realize that I left my bag on the train. So, once I get to the bottom, I rush up to the top, get on the train and fail to find my bag before the doors close and I fall back asleep. I wake up barefoot in the barn from Resident Evil 4 where you torch the hangy evil man, near Lacrosse, Wisconsin, and take a step outside. Here I find that it's in 1800's reenactment mode, and I hurry to find some buses out of there. I sit next to a young girl on the bus and I find myself at her house. After taking a pee and looking at her weïrd shaped door, I decide that I need to get out of the house before her parents discover that I had been there alone with her, as to not get shot. (All in the while I've been trying to get to a place where my parents can pick me up)

This is when the body snatchers thing starts. I see her parents having a good time on the lawn mower, and make a dash in the other direction. Then I bump into a more bloody version of her father, and then it comes to me that the people I know and care about are being replaced by aliens. Copy-father sees me and starts running after me, and I bolt. He catches up and we tumble into a ditch.

Now the dream enters abstract mode, on the other side of the ditch, vertically, there's a red ball of shiny. Thinking that it's the infamous red matter of the new Star Trek movie, the copy-father has a speech bubble that says, oh, that's heavy. We then tumble into the ditch and fuse with the ball, which becomes a red and flesh colored swirl. The red part, which is also the copy-father, leaves goes into a Terry Gilliam-esque animation machine and comes out as a rather thin, short, saggy rectangle. Then the fleshy ball, me, goes through the machine, and comes out thick, organic, complex, long and rather mushroomy. Of course I identify the phallic imagery, and know that because I'm a real human, I'll make the better lover in bed. During the animated portion, scenes of really awesome freaks from the Jerry Springer Show are spliced in.

I've only identified the body-snatchers chase theme as a recurring element of the dream. I wonder however, if it means something.