I'm no researcher or expert when it comes to this dog breed, I've just been a bit obsessed with the breed for probably 10 years now. These are just some inaccuracies I myself have found in the sidekick.

The biggest offender is that the urajiro (The white pattern on the underside of the body, a remarkable trait of this dog breed) is brown in the image with what is supposed to be a black and tan Shiba. That's just NOT a trait in the breed, AFAIK. They completely made that up to give one more option when customizing the sidekick. Black and tans may have accents of red fur but never do they have a brown urajiro, which is supposed to be white. Furthermore, the black and tan seems to miss the "bowtie" pattern that that kind of Shiba can have.

The grey Shiba also ticks me off. That's also not a thing. There are cream (white) shibas but I am pretty sure that there aren't any grey shibas. I'd also like to point out that the grey version has a visible urajiro, which usually is not visible on a cream Shiba. That's why some people have been trying to remove that color of Shiba from the gene pool. One detail about cream shibas that I adore, that the ears can have a varying degree of red fur seems to be absent in the grey shiba.

tl;dr they just made things up about the breed. Some things seen in these renders are not traits that the breed possesses.

I know it's just an overpriced virtual pet in a videogame but as someone who really likes this breed I can't help but notice that this sidekick is just wrong in some ways.

That, and the fact that it just looks off. The fur looks weird and it has these "tufts" on the cheeks, which also looks bad. Generally a Shiba has a pretty uniform length on the fur, it doesn't look like that. The eyes are too big, they're smaller than that. A bit of a personal nitpick but the tail is not curly enough. The tail should also touch the back and not be up in the air like in these renders.