I know you're joking but its this kinda of corporate attitude that are putting a rift between IP's and the fan-base. They either don't know or didn't care. It's no different than putting a red shirt on Kirk or something. Canon matters so does your fan-base.
I agree with you, Solium! I mean, I do feel that people can get carried away sometimes. There are details so minute that I feel like fans go off the deep end about them, and at a certain point a slavish devotion to canon can be detrimental, I happen to feel. But putting an "A" there is a pretty big and ridiculous error. I mean, the whole short is sort of fashioned as a love letter to thirty years of the Kirk era of Trek. Who are they making it for besides people who care?
Yeah, I don't think that was Giacchino's fault at all, as it was all artwork and animation at that point. It probably slipped past the team that was reviewing it. That short jumps around in time so much that they were probably confused about where we were supposed to be in the TOS feature timeline at that point.
There's one other option I just thought of. I read over a decade ago the licensor insisted all depictions of the Refit Enterprise (AKA movie Enterprise) have the "A" mark on it because they felt, erroneously I'm sure more people recognize the Enterprise "A" over the refit Enterprise. I don't know if its true now, but I know anyone producing a product with the visual depiction of the movie Enterprise had to add the "A".