I know there's a connection between the Love Theme and Hook, but I've found a third one. Towards the end of All Dogs Go To Heaven 2 (My little brother is watching it), you hear the entire first half of the motif or whatever it's called. The duhhhh-duhhh-duh duh duh duuuuh duhhh. It sounds exactly like it, pacing, notes, everything. It just doesn't continue after the down note that appears in the middle of the main part of the Love Theme. Sorry I'm not more musical-term inclined, so I may not make a whole lot of sense.