Along the very top edge between maybe 1/3rd from the right and 1/2 way there are 2 objects a large dot and a small dot. Between frame 3 and 4 they don't seem to jump the same way other objects do. This could just be my eyes or some other thing but I marked in an asteroid and commented to just see if a more experienced person could tell.
I think it's becaude it is so close to the edge. Probably because of the lens. The stars on the top right also shift a little at that frame.