Gaffe Squad

I was perusing the Zoetrope site and one user was railing against GLADIATOR. Now, I happen to enjoy the film, but was taken out of the movie early on by a gaffe. I was curious if anyone else caught it, or if there are other notable gaffes from recent movies that you would like to mention.

In GLADIATOR (in fact, in the first ten minutes), Maximus rides up to his sentry and asks where their scout is. The sentry responds, "He's been gone for two hours...", after which the scout returns sans his head.

My question is, did the sentry have a Flintstone wrist-sundial? And did anyone really have a concept of "hours" in Roman times? Gawd, I howled when I heard that, and couldn't get past it for most of the movie. Otherwise, it was a really good film, but that gaffe really fried me.

Also, in U-571 (another pretty good flick), Harvey Keitel is referred to as having been in "World War One". I don't believe that it was called that until after the end of World War Two. Up until then (and even afterwards), I believe it was "The Great War". Anyone else find that odd?

Hope this is a good thread... thanks!