Are you sure? It kinda looks like it’s popping between sprites to me.
Well in that case they created a shit ton of sprites just for this part. The video I linked doesn't do the game justice, it isn't 60 fps. Playing the game on an emulator and going frame by frame, you can see that there's a size for every distance possible for both sprite and on each angle. Wouldn't it take too much ROM size on an SNES cart?
One of the system's very first games, F-Zero didn't use an enhancement chip either.
F-Zero doesn't scale any sprite. each vehicles have a set of different size and the game will use them according to the distance from the camera.
Here's the spritesheet for the Blue Falcon for example:
https://www.spriters-resource.com/snes/fzero/sheet/13325/ you can clearly see that there 7 different sets of sprites and that the smaller the sprites are, the less animation frames there will be or in that case, it's more an orientation depending of the position compared to the camera.
Lower resolution and way worse audio hardware than SNES had.
I see this kind of comment a lot.
The SNES may have a better resolution, but you also have to take into account that it's a 8:7 aspect ratio, meaning that EVERY SINGLE GAME on the SNES displayed on a TV will suffer from being stretched. The GBA may have an inferior resolution but at least the pixels were perfectly square and thus, there was no stretching of the image since it was directly displayed on it's own screen.
On the audio hardware topic, while it's true that the SNES sounds better in quality (I mean, even the DS sounds worse in pure audio output quality), you should not forget it was also heavily limited by the SPC700's tiny 64KB for the whole audio ram. Everything had to fit inside of this so the audio engine, the effects such as reverb or echo and the samples had to share this tiny space. That means that the samples had to be heavily downgraded from their sources. The GBA did not have these limit since everything was done on the CPU and everything was stored on the main RAM. I'm not sure you can have this one a stock SNES:
(And no MSU1 doesn't count)