The mark above the date would be a zinc blister that has popped, and happened to form roughly the shape of a "D".
A repunched mintmark would have the two mintmark letters exactly the same size and shape, since they'd be using the same punch both times. But as pointed out by others above, they stopped doing the whole mintmark-punching-separately thing in 1990. So a "repunched mintmark" or any other form of wandering mintmark is literally impossible on a coin from 1994.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis