Memorizing mucked upcards in Stud

[SuperUberBob]

Here are some situations:

1. I am playing in a middle/high limit live Stud game. Unfortunately, I have a horrible memory and cannot memorize any of the mucked upcards. However, my opponents can memorize all mucked upcards with 100% clarity. How big of a disadvantage is that for me?

2. What if I am the only one able to see all the mucked upcards with 100% clarity and nobody else can?

3. Are there Stud cash games where it is unnecessary to memorize these folded cards to have an edge against your opponents? Or is memorization mandatory?