Excellent topic here. First off, I agree that we may be having more Hollywood themed dreams these days due to the media(I've had plenty of Jack Bauer escapes), but if our dreams are really changing in their nature, I would say it's because our brains are evolving.
I used to be a
serious dreamer.
In college I began having extremely lucid, vivid dreams, where I would meet people I have never seen before, tell those people that we were all dreaming, and fly around like it was nothing. Basically I was an active participant, directing the course of the dream rather than being a witness.
I also had a series of precognitive dreams, where I saw something happen that happened to me later in life. Some were significant, some meaningless. I swear to god I dreamed the Antione Walker/Raef trade before it happened,(believe if you will, no one on this board has ever given me any props), and later found out that my father and his mother (my gmom) have both had precognitive dreams in the past. Crazy stuff! Unfortunately I never remember my dreams anymore.
Anyways my Grandmother's dreams were extremely shocking and deeply frightened her. As a strict Irish Catholic, she thought she was possessed or something. She actually dreamed of a murder happening before the actual event.
I imagine that her dream was quite vivid, lucid, creative, frightening, exciting, etc, much like the crazy ones that we have today. Perhaps now a days there would be Music by John Williams, Helicopters, explosions, Lightsabers, and Christian Bale chewing out some sound guy

So to some it all up, I think that we have always had lucid, vivid dreams, where we can see through the symbolism and translate some real meaning and knowledge out of our dreams. It's also arguable that 100 years ago people were exposed to all of their media through reading, so they may have in a way been more creative than us, needing to constantly visualize and imagine their media, rather than perceiving it through site and sound. Like I said before, I believe that our dreams will only evolve if we evolve, not because of Jack Bauer and the internet.
