Alternate ending sequence:
Collect all twenty blue gems to view a congratulations screen after the ending FMV sequence.

Blue gems:
To get blue gems, Find the three red gems in any level. Then, win the bonus game at the end of the level and the Genie will reward you with a blue gem.

Defeatin minatour warriors:
To kill the minatour warriors found in the pyramids, attack them when they start walking around you.

Defeating Bow Warriors:
To kill the Bow Warriors found in Agrabah, hit them when they start spinning their bow.

Defeating minatour guards:
To kill the minatour guards found in the pyramids, throw four flaming swords at them, then hit them with your sword.