This particular angle hasn't been explored that I know of. I can think of a few reasons why people notice the mistakes in the Cameron movie:
1. Some of them are jealous of the director's financial and professional success. (Which is deserved IMO - the guy works like one possessed.)
2. Some of them are adolescent males who feel insecure because their adolescent female property are ga-ga over Leo.
3. Personally, I resent paying $9 for a movie, freely suspending my disbelief, and then being suddenly jerked out of the moment by stilted, hackneyed dialogue and glaring physical errors. One moment, I'm in 1912, and the next, I'm sitting in a movie theater wondering what the next implausible plot twist will be. Especially when the director has assured me for months that no expense was spared in making the experience as authentic as humanly possible. Yeah, right.