Plot hole: The Kaiju's EMP fries all electrical circuits next to him, and affects the base as well. If that's true, how did the helicopters carrying Gypsy survive the blast without having their electronics fried? EMP pulses induce current in all electronics regardless of whether they're powered on or not.
Factual error: The coastal wall in Sydney is shown as being inside the Sydney Harbour (right next to the Opera House). But Sydney Harbour is not on the Pacific coast but a part of the Parramatta river, several kilometres from the ocean (where the wall should have been). So the wall is either not shielding the northern part of Australia or (more likely) the producers decided that the audience cannot tell that it is Sydney unless we see the Opera House.
Factual error: Gipsy Danger's fist bumps into an office table as it screeches to a halt. The Newton's cradle on the table has an impossible reaction. All of the balls would simply sway in parallel, and not the 'classic' reaction displayed in the movie.
Stacker Pentecost: Today at the edge of our hope, at the end of our time. We have chosen to believe in each other. Today we face the monsters that are at our door, today we are cancelling the apocalypse!
Question: What I don't get about this movie is when ever they fight one of these giant monsters, why do they always engage in hand to hand combat for most of the fight? Its not until the end of most of the battles that they remember they have weapons to fire at these beasts and kill them which works with the category 1-3 beasts just fine. Why not just shoot the things?
Answer: Most likely they only use it when they know they have a guaranteed shot and won't waste it. It can't be reloaded that easily. Like having one bullet to kill a zombie vs a sword so go for the sword save the bullet it's more valuable. That's typical military tactics. Possible firing whatever weapons could cost a ridiculous amount of money just like missiles do. It's not exactly like Yeager weapons were mass produced they are all different. Last reason is reducing extra casualties by making sure they don't miss when they fire or making firing weapons the last resort. And just for the movie's sake it would be boring as crap if they just blew the heads off in seconds.
Question: Is it ever established why the Kaiju attack cities? Why they perceive a challenge, a threat, a resource worth taking there specifically? If they are a decent biochemical match to Earth life, and are hungry, why don't they attack schools of fish, or fishing/whaling vessels, if nothing else, they should attack the cannery row? If they are after a non-living resource, like minerals, why don't they root through the seabed or attack mines?
Answer: Because they are scouts for an invasion of Earth from another dimension. They are testing our response to their arrival and military capabilities and the best way to attract military attention is to attack population centers.