What makes this one especially sweet is that Alfred appears to have still been rather young when he died. Even though Gertrude is now a half-blind old woman, Alfred is still clearly enamoured with his wife.
Mayhew cheerfully greets the butcher he was hanging out at the beginning with, implying that they were friends when he was alive.
Victor was willing to die for Emily. Granted, he could see the afterlife was not so bad, but being able to overcome ingrained survival instincts by the Power of Love alone is impressive.
Emily getting between the sword and Victor protecting him from Lord Barkis has to count.
There is another brief moment from Emily during Victor's fight against Lord Barkis. At one point, a number of church benches are knocked over, so Emily puts her hand on Victoria's shoulder and pulls her to safety.
Near the end of the duet, note how Victor reacts to Emily's detached hand. The last two times that her arm came off and held onto Victor's arm, he shook it off in fear. Now, he takes Emily's hand without a blink or sign of fear and sweetly reattaches it back to her arm, even complimenting her.
In a bizarre way, typical of Tim Burton, there is the moment when Emily drags Victor to the netherworld in front of Victoria. However shocking that sight is to Victoria, at least it is a relief to know that she understands that her betrothed has not abandoned her of his free will.
After they first meet, Emily makes a sincere effort to get to know her new husband, and Victor reciprocates, albeit briefly.
The fact that Emily somehow found Victor's old dog Scraps in the underworld and gave him to Victor as a wedding present.