I was messing around with level modes 3-6 and I noticed the following points of interest:
-Layer 2 is in the wrong position, apparently because it's actually in the opposite orientation(vertical in a horizontal level and vice-versa)
-Modes 4&6 have interactive Layer 2, modes 3&5 do not, but it's hard to tell because...
-The graphics don't refresh; it pulls Object Layer garbage based on whatever was onscreen last.
-------------------- Let's milk Sunny Milk. Then she'll have enough money to fund Sunny Milk Real Estate.
Everypony's digging with a shovel