Iron Man 2 (2010)

Other mistake: When Stark was making the new Triangle core, where the Laser beam melts everything on its path, you will notice that the wall, locker, shelves are cut into pieces, but when the powerful laser beam reaches the core, all three wires were left unscaved/not scorched. (01:23:00)

Other mistake: Justin Hammer picks up the M134 like it's a feather. In reality, it's a hundred pound gun, even a big bloke would have to work hard to pick something like that up.