On top of that, you've got complexities added by Mary Jane Watson (Kirsten Dunst) and Gwen Stacy (Bryce Dallas Howard). Basically, the web-head gets a little adoration from his fans and ends up sharing his "special" upside-down kiss with Gwen Stacy, in front of Mary Jane, God and everybody. Mary Jane was upset by this cheapening of their special kiss, causing problems between Mary Jane and Peter Parker, giving Harry Osborne an opening to try to take Mary Jane away from Peter. Add in the effects of the black symbiote suit on Peter's psyche, and you get a dark, brooding, "emo" Peter Parker, and a darker, power-drunk, blood-thirsty version of everyone's (previously) friendly neighborhood Spider-Man. The "emo" aspects of the symbiote's effects came off as a bit corny in the film. This wasn't helped much by a scene where Peter uses his heightened reflexes and dexterity to perform a show-stopping dance with Gwen Stacy... at a restaurant where the down-on-her-luck actress/waitress Mary Jane was working, just to make Mary Jane jealous. This was a side of Peter Parker I would have preferred not to see, and that goes double for the dance, itself.
As for a couple of to-be-expected cameos, yes, both Bruce Campbell and Stan Lee make appearances in Spider-Man 3. Bruce Campbell plays a snobby Maître d' at an upscale restaurant where Peter Parker plans to pop the question to Mary Jane in a particularly funny and star-crossed scene. Stan Lee plays a guy in Times Square who talks to Peter and says that one person can change the world, referring to Spider-Man, of course.
But, truthfully, the movie itself is not the only reason to get the 2-Disc Special Edition of Spider-Man 3; the reason to pick this version up is for the special features. The movie, itself, is approximately 139 minutes; that's just over 2 hours. The special features, on the other hand, add over six additional hours of Spidey goodness. If you're a fan of Spider-Man, this Special Edition will answer pretty much any questions you may have had about the making of the movie... and quite possibly several you didn't realize you didn't know.
Each of Spidey's foes get their own "making of" featurettes which explain how the special effects were created and how characters were cast for these pivotal parts. Another featurette shows how the stunts were filmed in both New York and Cleveland; it seems that some stunts simply couldn't be filmed in New York, due to the traffic, and Cleveland turned out to be similar enough in appearance and willing to work with the production company a great bit. There are also featurettes that show just how intense some of the stunts in Spider-Man 3 really were. I was surprised to find that some of the special effects which I had assumed were computer graphics were, in fact, actually really cool stunts. Those interested in how stunts are put together will find these featurettes to be really interesting; I know I sure did.
Overall, Spider-Man 3 belongs in any Spidey fan's collection and if you are all about the background info, then definitely pick up the Spider-Man 3: 2-Disc Special Edition for all the extra goodies.
