Crom said:
If you want to watch a movie with gun flubs, check out "Battle Of The Bulge".
Henry Fonda uses an M1 Garand to try a long range shot at the German Panzer Commander. Funny thing is if you look closely at his rifle it has no rear peep-sight (no wonder he missed). Chaffee Tanks are referred to as Shermans, M48 Patton Tanks are used as German Tigers, there is a Browning50 Cal. M-2 mounted on a German half-track, and it's a C-47 that drops the German paratroopers.
Large peices of military equipment are, more often than not, incorrect. For a perfect example, see the large tank battle scene in Patton.
This is because oftentimes production companies will secure the help of actual military forces in filming, and the director is pretty much stuck with running what they brung.
Especially in the days before the ability to hire Digital Domain or Industrial Light and Magic to recreate an entire rolling army of obsolete and (now rare) vehicles.
Oftentimes in these threads people nitpick the innaccuracies in movies with no thought given to what it actually takes to
produce a movie in the first place.
Even assuming the director and producer(s) are attempting to be authentic, it's still possible for things to get flubbed in any one of the three major parts of film making- improper research done in Pre-Production can result in anachronisms and incorrect information fed up the line. Screw-ups on set, equipment failure, bad weather, budgetary constraints, or any number of nearly an infinite number of factors can cause flubs during the Production phase, and even more flubs can be introduced during the Post-Production phase as a result of sloppy editing, a lack of footage to work with, an ignorant foley artist, or incorrect texture maps used by the 3d animation firm.
Film is a highly collaborative effort undertaken by literally thousands of people on any given production, and if even one or two of those people aren't in the loop, it can result in visual and audio goofs.
Realize that I didn't even touch on the design firms hired to create the posters, flyers, DVD covers and inserts, publicity stills, television trailers, and websites used to promote a film.
"A movie is never finished, only abandoned."
~ Variously attributed to George Lucas, Martin Scorsese, and Francis Ford Coppola.