Currency has no weight or volume. So go ahead, take those 1000 gold pieces that weighs 50 kilos and jingles so much you sound like a herd of goats.
Even though there are many different currencies there is no need to carry more than one. Everyone accepts everyone elses without question, and at equal rates of exchange. (Bonus)
Metal armour never makes a sound, even if it is chain mail or has never been oiled or maintained.
Any route between two cities involves a auduous, solitary, dangerous, life threatening passage, even though it is a common trading route that should be used by thousands of people a day.
If per chance, you do find a trade route used by thousands of people a day, you cannot use it in case you are seen. This is despite it being used by mercenary guards who look exactly like you.
You don't need to be good at languages. They will always understand you or a translator will miraculously appear when you need one, and he will just happen to speak both languages.
No matter where you eat, how dirty the dishes are, what you eat or how rotten it is, you will never get dysentry.
Every town and hamlet has a tavern. Every tavern has a spare room to let, edible food and plentiful alcohol, (regardless of famine, war or pestilence). Service is guaranteed despite race, religion, language, sex, clothing and that nasty rash on your arm that looks like the plague.
Every customs official is corruptible with a simple bribe. Makes them a bit pointless, really, but they do not seem to mind.
Even though you may be the most religious person in your party (that powerful, high priest mage dude), you never once have to pray, offer sacrifice or attent a church service to your God.
Every castle has a dungeon. Every dungeon has a dragon, no wait, that is a different game...
Most of all, no matter how many pages pass, it will all turn out in the end. Everyone really does live happily ever after, unless they are evil, but then, they were never happy to begin with. Really, you are only doing them a service by putting them out of their depressing, friendless and joyless lives.