What makes this one especially sweet is that Alfred appears to have still been kind of young when he died. Even though Gertrude is now a half-blind old woman, Alfred's obviously still madly in love with his wife.
Mayhew cheerfully greets the butcher he was hanging out with at the beginning, implying that they were friends when he was alive.
A man and an undead woman are briefly shown embracing each other, implying that they were husband and wife.
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.
Or far more likely, as her finally realising that she doesn't need to hang on her Tragic Dream anymore, and she's free to go to Heaven now and rest in the peace she deserves. In any way, it's lovely and awesome.
Especially since her choice didn't even take Victor into account - she was perfectly content with marrying him and having him all to herself...until she sees Victoria standing nearby, dressed in her bridal gown, looking on in shock. It's only then that Emily realizes that as much as she wants to live out her lost dreams as a happy bride, in doing so, she's stealing those same dreams from someone else.
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.
In addition, the fact that none of the dead discriminate against the still-living Victor. One might expect them to show envy or prejudice against him for still being alive or being married to their beloved Emily, but no, they welcome him and treat him as one of their own.
The fact that Emily somehow found Victor's old dog Scraps in the underworld and gave him to Victor as a wedding present.
Watching Victor's reactions to the characters and atmosphere of the underworld change is really heartwarming, considering how he reacts when he first arrived compared to his disposition during the Wedding Song.