Firing a weapon next to someone's head can (and often does) cause permanent hearing loss. It would be an asinine training maneuver to risk serious injury to a trainee by discharging a handgun within several feet of them.
A request from Hurley to the pilot - 'Get me on that boats bandwidth'
The correct description to establish contact with a ship or craft with a radio is 'channel'. VHF is the bandwidth for all channels used.
The initial impact of the giant wave into the fleet strikes the ships abeam, that is perpendicular to the ship. If this was the case, most of the ships would have been capsized but in the calm sea after the wave, only one ship has been capsized.
When the opening engagement scene is being filmed on the protagonist's, it's clear in several scenes that the screen is either blank (indicating that nothing is being filmed) or the screen has a photo on it which is not what is front of the camera lens.