Answers have been confirmed by Reiner Knizia.

Earlier rules translations may not have made the following points clear.

End of Game
The game ends the instant a player reaches zero, no further scoring takes place. If two players score simultaneously and both reach zero at the same time, then the game is a tie. This is also true if two players reach zero even if they started on different scores, e.g. Player A is on a score of 1 and Player B is on a score of 2, if they tie for an artifact and score 2 or more points each then they will come joint first.
HOUSERULE : If the game ends with a tie, the player to score the furthest past zero is the winner (in the example above, Player A would have won).

Who Comes Second
The rules do not state how you resolve who comes second, third, etc.
HOUSERULE : As soon as someone reaches zero, the game ends at that point and no more scores are awarded. Second place goes to the player with the lowest score at that point, third goes to the next lowest, etc. If players are on the same score, then their position are tied.

Money Tile (Coins)
The money tile must be played as soon as it is obtained. It is used immediately to steal an artifact from another player BUT you must have already obtained an identical artifact before. If you cannot fulfil this condition, then the tile is useless and is discarded. The player who just had a artifact stolen is awarded one point and the money tile is then discard.

The large triangular tile at the head of the line of artifacts is called the "Gold Mask". It can be considered as a full "joker" tile which counts as if it was a real full value artifact. It can be used on its own when an artifact scores (which is not the case with the tie-break tile or the money tile).

Resolving multiple ties when scoring artifacts
A three or more way tie is scored as ZERO points. There is no first or second place score and so no-one scores.

Q)
What is the sequence in scoring once an artifact has been exhausted? Does the first place player receive points, THEN the second place player, OR do both players receive points simultaneously?
A)
The player with the most artifacts scores first (does not matter if he was not the same player who picked up the last artifact), the second place score is awarded AFTER this. If it is a tie, then they ARE scored simultaneously. If the first player manages to reach a score of zero points (i.e. win), then the game ends immediately, the second place score is NOT awarded.

Q)
Let's say I move onto an artifact that is now exhausted (I have taken the last in its series). In the process of moving, several pieces fall behind the last player and need to be removed from the board. Of these now removed pieces, a couple result in exhausted artifacts. Which is scored first - the exhausted artifact as the last player in the path passes it, OR the exhausted artifact the player lands on?
A)
You always score the artifact taken by the player first. You then discard artifacts one by one (from the tail end), scoring any as appropriate.

Example
1 to 7 are artifacts and M is the players marker in last position
7 6 5 4 3 2 1 M
If the player moves his marker and picks up tile 4, i.e.
7 6 5 M 3 2 1
then the artifacts are removed in the order 1, 2 and then 3 (after tile 4 is scored first).

Q)
Let's say Player A has four chair tiles and Player B just lands on his 4th chair tile, thus exhausting the artifact and resulting in immediate scoring for that artifact. If Player A has a Pharaoh tile (as the tie-breaker), must he discard the Pharaoh tile with all the chair tile to receive tie-breaker status? What if Player A and B both have tie-breaker tiles (there are three pharaoh tile) they want to use?
A)
There are three tie-breaker artifacts in the set and they can be considered as worth a faction of a 'real' artifact (1/10th or some such small value). It does mean that if one player adds two such artifacts against one, then he will win. Of course, you need at least one 'real' artifact before you can use the tie-breaker.

One point to note, if a player decides to use a tie-breaker, then he is not allowed to 'take it back' if another player decides to use one as well. Once you announce you will play the tile, it is gone from your hand. You cannot play one to see if your opponent will play one and then mutually agree to withdraw both.

There is no set order in which you must play the tie-breaker (Pharaoh tile). Either player may forward one (or more) to play, in which case the other player may also add one (or more), etc.