According to Jeremy Crawford the "Dragon's Breath" spell also targets the creatures hit by the exhalation, and Green-Flame Blade targets two creatures.
My understanding is that according to JC, any creature "affected" by a spell is considered "targeted" by it.
Suppose I subscribe to JC's ruling.
I cast a conjure spell (say, Conjure Animals). If my summoned creature attacks an enemy, is that enemy considered a "target" of the conjure spell?
No, the conjured creature was the target of the spell, as the spell creates the creature. Any creature attacked by a conjured creature doesn't just become the target of the spell that conjured the creature, because they aren't being directly affected by the spell. Being affected by a spell means that if, say, color spray was cast, and the 15 ft. cone included 2 creatures.
Those 2 creatures are considered targets, because they are directly influenced. After that, anything they interact with in any way doesn't then also become targets of color spray. If a spell creates, conjures, or summons something, unless the spell says otherwise, anything that that object, character, or creature interacts with in any way does not become the target, as the spell is simply creating that thing, not targeting anything that that thing interacts with. That's just not how spells work.
If we subscribe to Jeremy Crawford's ruling, we need to take into account this tweet:
A rakshasa's Limited Magic Immunity offers no protection against a summoned creature. The creature's presence is a spell effect. The creature itself is not a spell effect.
The conjured creature itself is not a spell effect, and therefore the attacks of the conjured creature are not spell effects either.
As a result, the spell does not target the enemies attacked by the summoned creature.
