There are quite a lot of star clusters in M33/Triangulum (e.g. https://arxiv.org/abs/1402.3029 https://arxiv.org/abs/1402.3029), so some of the bright dots may

There are quite a lot of star clusters in M33/Triangulum (e.g. https://arxiv.org/abs/1402.3029 https://arxiv.org/abs/1402.3029), so some of the bright dots may not be individual stars. There are stars which are bright enough to dominate the light within a PSF (point spread function, or resolved region size). They will, of course, be physically much smaller than that size.