If you lose in any of the gambling games and then reload your saved game, the game will force you to wait 30 seconds to prevent you from cheating. However, there is a way around it. When you are at the slot machines, do not exit slot machine mode to reload your game when you lose. Instead, once the wheel stops spinning and your results are shown, pause the game and reload your saved game. As long as you do not exit slot machine mode before reloading, you will not be forced to wait 30 seconds after reloading. To make easy money, try the slot machine at its maximum of 200 tokens. Never try more than twice at a time. If you lose both spins, just reload your saved game. If you win one of the two times, save your game and continue. Note: This glitch was done on an unpatched version of the game.
In Guardian Peak, you will meet an NCR soldier who is wounded. Through some Speech checks, you can get him to give you his gun for escorting him out of the cave that he is in. When you get to the entrance of the cave with him in tow, he will speak, and you can keep asking him for his rifle, which he will give you along with ammunition. Note: This is best done after getting the perk that allows for over encumbered fast travel.