So you know how our world has no alchemy, but in turn has technology? Well after watching episode 50 quite a few times, I realized something...the car noises in our world sound different from the car noises in the FMA world. Listen whenever they ride a car in the previous episodes...I always thought it was weird, but paid no attention until I heard the London car noises in ep 50 and compared them.
So maybe in the FMA world, their technology for automobiles are different then ours in that time period? Ed was freaked out when seeing the planes and zeppelins, after all. Maybe in the FMA world, instead of building engines and such, they use alchemy?
Yeah, random and useless, but I thought it was interesting.