If the spell has damage divided as it was cast, the division can't be changed (although the targets receiving that damage still can). The same is true of spells that distribute counters.

If the spell that's copied is modal (that is, it includes a choice from a bulleted list of effects), the copy will have the same mode. A different mode can't be chosen.

A copy of a spell is created on the stack, so it's not "cast." Abilities that trigger when a player casts a spell won't trigger.

For the second loyalty ability, the spell you cast must be an instant or sorcery spell, although the exiled card doesn't necessarily have to be. For example, if you exile a creature card that has an Adventure, you can cast that Adventure spell.

You can't choose to pay any alternative or additional costs for the copy. However, effects based on any alternative or additional costs that were paid for the original spell are copied as though those same costs were paid for the copy.

The copy will have the same targets as the spell it's copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. If, for one of the targets, you can't choose a new legal target, then it remains unchanged (even if the current target is illegal).

If the spell that's copied has an X whose value was determined as it was cast, the copy will have the same value of X.

If you copy a spell, you control the copy. It will resolve before the original spell does.