Glitches: It shouldn't happen in final versions yet it does, it's not always bad news but it always make the publishers look like they just didn't care. Classic examples being that shitty sonic port on gba or the street fighter 2 that actually freezes if you vs the Akuma boss, or better yet this glitch screenshot of urban slug brought to you by urbanprophet in the gff arcade 
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You will find glitches in every game. They're never perfect. Bugs can be hard to nail down or they're so insignificant that the developers will just pass them up in order of priority and to ship the product. However there are some developers who don't give two shits about some bugs, but then again they are usually incompetent to begin with.
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Hidden Endless Loops: This ones a little tricky to explain but basically in videogames where you enter an endless loop with almost no chance of escape to progress, so you waste your time trying to escape when you pretty much can't. Classic examples I know of being how kid chameleon was a maze of stages in itself that didn't have to be all done in order or at all for that matter, or in ninja gaiden how some of the bosses are near unbeatable without powerups, so if you don't get it right the first time prepare for a lot of bullshit to come...
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Those really are not endless loops. That's bad game design. I definitely understand your frustration however and I read about earlier adventure games where you couldn't progress unless you had an item which was at the beginning of the game and there is no way to go back. An endless or infinite loop is something kind of like the Minus World in Super Mario Bros. It keeps on going forever with no end unless you restart the system. From what you described it just sounds like you can get something somewhere in order to progress.
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