Please let me know if there are any I've missed. Thanks in advance.

[added Sergovan's feedback]

Initiative

Basic Rules

In scenarios with provided lists, the Imperial player has initiative.

With custom lists with different point totals, the player with the cheaper list has initiative.

With custom lists with equal point totals, the Imperial player has initiative.

(What to do when both players have equal-value lists of the same faction is not defined.)

If both players lose their last ship at the same time, the player with initiative wins the game.

Tournament Rules

With custom lists with different point totals, the player with the cheaper list chooses who has initiative.

With custom lists with equal point totals, pick one player by coinflip. That player chooses who has initiative.

If both players lose their last ship at the same time during a Swiss round, the game is a draw.

Asteroids

Basic Rules

Each asteroid must be at least 2 Range units from all table edges.

Tournament Rules

Each asteroid must be at least 2 Range units from all table edges and at least 1 Range unit from all other asteroids.

Target Lock

Basic Rules

You may measure the distance to an enemy ship before deciding whether to Target Lock it.

FAQ - Tournament Rules

You must declare your intent to Target Lock an enemy before checking its range. If it is in range, you must complete the lock.

Focus Tokens

Basic Rules

If you discard a focus token to modify an attack/defense roll, you must change all focus faces to hits/evades.

FAQ - Errata

If you discard a focus token to modify an attack/defense roll, you may either change all focus faces to hits/evades or leave all focus faces as-is.

Barrel Roll / Boost

Basic Rules

Large ships perform barrel rolls using the same procedure as small ships.

You may boost and barrel roll across obstacles.

You may check if there is room to barrel roll before deciding whether to perform that action.

FAQ - Errata

Large ships perform barrel rolls with the 1S piece parallel to the ship.

You may not boost or barrel roll across obstacles.

FAQ - Tournament Rules

You must declare your intent to barrel roll, including direction, before checking whether there is room. If there is, you must complete the action in the stated direction.

Under Initiative:

In tournament elimination rounds, if both squads are destroyed simultaneously, the one with initiative wins. In non elimination rounds it is a draw.

Target Lock:

The FAQ version is for Tournament rules. Basic is still you measure and then pick, in tournament you pick and then measure.