About the new compatibility rules

[XMuppetSB]

I remember when the new compatibility quest rules were added in 2.50.1RC1:

Old GOTOLESS Behavior
Old Lens Drawing Order
No Fairy Guy Fires
In 2.10 and lower, fires do not appear in guy rooms with a fairy guy, and the message string and invisible barrier have no functionality.
Continuous Step Triggers
Downward Hookshot Bug
In 2.10 and lower, the Hookshot can pass downward through solid combos.
Fix Open Door Solidity
No Solid Damage Combos
In 2.10 and lower, solid damage combos do not hurt Link.
Old Hookshot Grab Checking
Peahats Are Vulnerable When Frozen By Clocks
In older versions, Peahats could be damaged when frozen by a clock picked up by Link. With this rule off, Peahats are invincible when frozen by clocks.

But out of all these, I was only able to fill in information on 4 of them; the 'No Fairy Guy Fires' and 'No Solid Damage Combos' rules to be exact. I'm not too sure what any of the other quest rules are supposed to do, so could somebody please explain the rest of these?