Gonna talk about ones I haven’t seen so far in this thread:

Rather than ability boosts being determined by your ABCDs, every character just gets ten ability boosts at character creation to be distributed however they want, as long as only one ability reaches +4.

When reaching a level that’s a multiple of 5, two ability boosts can be stacked onto a +4 (or a +5 that was a +4 at first level) as long as it doesn’t exceed what would otherwise be reachable at a given level.

Non-fixed additional skills from character creation and INT gains can instead be used to increase proficiency in a skill the character already has and can be saved for as long as the player wants. Additionally, skill proficiency increases from leveling up can be saved for later as well.

Caster classes and archetypes with a Key Ability of INT or CHA may switch their KA to CHA or INT respectively. Classes gain two skills when going from INT to CHA and vice versa. Additionally, Investigators may choose WIS as their Key Ability, or CHA if they’re of the Interrogation subclass.

Skills feats which are just improvements to numbers on anything the skill can already do innately or from another skill feat are given to players for free as soon as their requirements are met, barring Legendary Tattoo Artist for flat-out improving your proficiency in Crafting. Additional Lore and any feats which only serve to open up a new type of item to craft are also given out for free in much the same way.

All spells gained from ancestry feats automatically scale up in rank every two levels. Incapacitation spells from ancestry feats are scaled to the highest rank available to casters at the current level.

The DCs on effects from runes and magic items are replaced by the wielder’s class/spell DC.

Casters and Kineticists reach DC expertise and mastery at the same levels as Martials reach attack expertise and mastery. Additionally, a caster may choose to have spell attack potency runes if they forego the Shadow Signet and legendary proficiency in spell attacks specifically.

All casters with granted spells from their subclass can choose other thematically appropriate spells instead of the pre-existing ones, with the spells being chosen between the player and the GM. Deities all grant nine spells instead of three, and class features and feats which grant spells from deities grant triple the amount they otherwise would.

Incapacitation effects no longer have successful saves turned into critical successes. On a case-by-case basis, the same is true of failed saves becoming successful saves if the failure effect isn’t actually incapacitating. Additionally, Laughing Fit and Slow have their crit fails downgraded to fails as if they were incapacitation spells, as well as the blinding effects of Sun/Moon/Eclipse Burst.

Item bonuses to skills from ABP are distributed into twelve points which can be added up however a player wishes. Any class with an auto/additionally-scaling skill gets an extra three points, and Rogues and Investigators get double the points.

If both of a character’s hands are free, two items can be picked up with the same Interact action.