These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complacent Gaming Syndrome: Once you figure out what order to perform each set of stages in, some levels become almost too easy, and several objectives can be reached by shortcuts — some easily missed, some not — that bypass most of the enemies.
Good Bad Bugs: Sometimes, when you grab a weapon in the hideout, it will have more than the maximum amount of ammo that it can usually carry. Sometimes, this is a small, unexpected bonus, and you'll get a few extra magazines. Other times, a sniper rifle will spawn with 8,000 rounds in it and you'll be able to spend the rest of the game shooting everyone from a mile away with the normally quite rare sniper ammo.