There's Haydn's Symphony 47. In the third movement the music is played forwards and then backwards note for note, in four sections. The whole of the slow movement is an old organ point written in double counterpoint at the octave. No, I don't really know what that last sentence means; I just copied it from the sleeve notes, but I thought you'd like to know.
When were the sleeve notes written?
The remarkable thing about Haydn's contrapuntally ingenious minuets is that they're still full-blown minuets, i.e., contain main themes, transitions, subsidiary-key material, contrasting middle sections, dominant preparations (if he wants them) and recapitulations with a subdominant turn. See also his D minor string quartet op76/2 (wherein, admittedly, the trio is the opposite of a canon, if you will).
