I agree with the replies above; Magic Missiles strike the targets the caster points at, without any ambiguity from phrases like 'intended target' or anything.
But I read into it from first principles for myself as well – in the 3E rules; not going back to 2007!
I think it might be worth pointing out Magic Missile's "instantaneous" Duration, give or take "instantaneously" pointing at multiple targets(!). The caster doesn't have the time to see the effect of one missile before launching the next; and the missiles aren't in flight long enough for the interweaving Mirror Images to foil them.
I slightly wonder at the multiple images using their DX bonuses to dodge missiles, and whether missing one ought to have a chance of hitting another! But that's not the spirit of the spell, so let's not go full 'simulationist'
Cheers,
–Os..
|\/ Osric, aka Neville.Percy@Gmail.com
|\/ "The keener and the clearer is the reason,
| the better fantasy will it make." -- JRR Tolkien