Happy Valentine's day! Unless you're a ROUE, RAPT when he SEES a PLUS-size model, we're flat out of luck for representation of this once religious, now aggressively secular holiday.
Instead, we get a humorous take on ELMERFUDD's speech disability, with standard phrases reinterpreted with wacky clues based on how he would say them. Thus, a treehouse becomes 17A: Small, cute, residence? (TWEEHOUSE). Clearly the best of the theme answers is 51A: What wakes everyone up in the morning at the duck pond? (QUACKOFDAWN). I am reminded of the crazy duck from the movie Babe.
The NE and SW corners are nice and chunky, with four nice 6-letter answers in a stack. Otherwise, because of the six theme answers, there are really no major down answers of interest. Perhaps my favorite answer in the whole puzzle comes at 50A: "Stop joshin' me!" (AWGOON), which as I looked over the grid just now, seemed like a cry to your bodyguard: "Aw, goon!"
1A: Helps (AIDS) gets a D because it looks like the epidemic of the 1980s.
But, really, the big news is that this puzzle is young Mr. Larsen's debut in the NYT, at age 13! Congratulations! We look for big things from you in years to come.