Recently I was doing research for an article on passive perception (detailed explanation of the mechanics can be found here) but I came across some interesting information on this game mechanic.

For me, one of the biggest surprises was the fact that advantage/disadvantage does not mean two sets of dice being rolled and taking the higher/lower variation. In the rules under passive percepetion it states that you simply get a + or - 5 to the roll.

Are there any other mechanics like this in newer editions?