In the recapitulation, the bass line in the first theme rises to B-flat instead of descending to F (as in the exposition), and the second theme enters in B minor, instead of F-sharp minor.
The bass line in the first theme rises to B-flat instead of. This is in the recapitulation. The bass line in the first theme is descending to F (as in the exposition). This is in the recapitulation. The second theme enters in B minor, instead of F-sharp minor. This is in the recapitulation.