Wood + Lugosi: The military/severe wounding connection
It's mentioned in the movie that Wood was a Marine vet who was seriously wounded (I believe in Guadalcanal) - hence losing his teeth. I ain't a Hollywood person, but I am a huge history buff, and I happened to learn that Bela Lugosi was badly wounded fighting in WW1 - 3 times, including brain injury. In fact, standard treatment at the time was giving the wounded morphine. This leads to a couple of points that could've been explored in more depth -
1) Instead of showing Lugosi as just another Hollyweird drug addict, they could've explained how he was 1st exposed to morphine out of necessity from war wounds. Questions of morality aside, it would've added depth to his admittedly well-acted character. In other words, show that his addiction wasn't just another bored actor who chose to chase the dragon, but it came about from something honorable, fighting for his country bravely and getting wounded 3 times! A couple of throwaway lines, Lugosi explaining how he 1st got addicted recovering from his wounds, would've made him even more sympathetic, rather than just another spoiled bored actor who bit off more than he could chew.
2) On that note, I don't know if Wood & Lugosi bonded over this, but veterans (especially those who've survived combat) share a bond that civilians could never understand. Maybe as part of the process of the 2 becoming such good friends, there could've been some allusion to their shared experiences: bravery, terror, severe wounding, recovery, etc. It's obvious they were close, and I don't know if they bonded over their war experiences, but showing them reminiscing/commiserating over the horror they'd seen and survived would've added depth to their relationship. Also, it would've added another dimension, other than Wood admiring Lugosi's work as an actor: he found a brother-in-arms, some1 who had been thru the same horror he had, sympatico.
Don't get me wrong, they're surprisingly good performances by Depp & Landau, and showing the Wood/Lugosi friendship was touching (especially how Wood repeatedly came running anytime Lugosi called him, how Wood pushed him into rehab then offered to pick up the tab, etc.). It's obvious Wood genuinely cared for Lugosi, and took his loss hard. I'm not a big Tim Burton fan, and any1 can critique, but I wonder why Burton didn't expound on these events - I'm sure they were pretty important in Wood's and Lugosi's lives.