While you're putting up with the game bugs, here's a few tricks to help settle the score.
Heuristic Park, the game's developer, has released an
an unofficial patch (one not sanctioned by Activision, the game's distributor).
More patch info is on the Files Page.
Pool gold to one character, then enter a town and then the inn.
Pool gold to a different character, then drop and re-add the player who had the
gold. Both players now have the pooled gold. [Fixed in patch]
Also, you can apparently buy items at guilds for less than their sell value.
Sneaking Into All Guilds:
Initiate a bridging class member (a class that belongs to your current guild plus the one you want
to join) quest, join the other guild, then drop the quest.
Cast Toughen on a character, then enter and leave town to permanently raise hit points. [?Fixed in patch]
Evil Eye Uses:
After invoking the item, drop or place it in the socket, then take it back to be used over and over.
Golden Lamp Uses:
After using the lamp, drop and pick it up to be used three times. Also, you can drop the lamp after
using it but before selecting a wish and it will remain charged.
Each character, however, can only invoke it successfully once, but
any character can choose a wish offered by the Genie.
Don't worry too much about completing any of the Temple quests in the first town. Completing the
last Temple quest at N'Ha, delivering a letter to Jathil, gives you infinite rewards and promotions
up to guild level 7. [Fixed in patch]
Ditto as above with the Leprechaun quest (second rogue quest in the third town), for me at least.
Apparently some quests are prone to stick as such if you don't listen to the entire
reward speech from the guildmaster. [Somewhat fixed in patch]
Enter a shop with a character having completed a quest, then click on a
different character portrait and then back on the first character.
Your character will receive a double guild promotion.
You can get click-happy for more promotions, up to guild level 7. [Fixed in patch]
This can be used for example to create six assassins.
In the middle of the NPC dialogue where the NPC takes an item away
from a character, have that character give the item to another
party member. Also, you can buy back quest items from NPCs, for example
to keep the Dragon Arrow or steal back the dragon ore to construct
multiple Dragon Plate Mails. [Fixed in patch]
Summoned creatures have stats-raising ankhs that you can steal.
If you feel like dodging ranged weapons for awhile (you can run faster than them),
monsters seem to have an endless supply.
Vanish and Climbing:
The land teleport spell Vanish can be used to re-visit Kerah's shrine
or skip the Temple of Isis altogether, and possibly others, such as
major steps in the game like Dragonspire Cave.
You can also, just for fun, climb into areas you're not supposed to
be in, such as over town gates.
Treasure chests are randomly seeded when you open them,
so you can save and reload while opening a particularly
valuable chest (especially such as the two final ones,
which contain the best items in the game - hmm, Sylvan Bow,
Robinsword, these look familiar...).
If anyone has found any intended quirks in the game, please let me know.
There's a few secret areas, such as a treasure area opened by pressing the
button in the firepit in the Serpent Temple kitchen, but I've yet to find any
truly exciting game surprises.
So far, the only thing I've tried is attacking the Genie, but that didn't work out too well,
and my party is too legitimate to manage or consider taking on the dragon, living tree, sphinx,
or other friendly deities. Also, as a minor diversion, if you use the evil element that she
gives you on the vampire in the castle, you'll find out first hand why the game received a
Mature ESRB rating.