These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Cajun fireflies are stereotyped with missing teeth and being "simple". Ray's subplot makes him look like a Cloud Cuckoo Lander, though the whole thing is about him being a firefly and has nothing to do with his ethnic group. And of course, that worked out for him in the end.
Averted with most of the white characters. They're noticeably wealthier and more privileged than Tiana and her family, but they're not depicted as arrogant. Hell, Charlotte is a better friend to Tiana than her nameless black friends in the beginning.
An Aesop: Having dreams and ambitions is all well and good, but work hard to achieve them and don't take any shortcuts that seem too good to be true.
Artistic License - Religion: Actually a rare invoked example - Disney didn't want to use any actual symbols for fear of offending real life practitioners of Voudou (or summon any evil spirits.) They essentially give a bit of this since Dr. Facilier and Mama Odie appear to practice magic and call it "Voodoo", however give Facilier a little bit of credit - he says "I got voodoo, I got hoodoo, I got stuff I haven't even tried", implying he (and the writers) are well aware that "Voodoo" isn't just a catch-all-term for folk magic.
That and there's a bit of Genius Bonus - Facilier appears to be using easily-bribed spirits, not so much caring for actual voodoo rituals so much as aligning with what will give him more power.
Especially when linked with good memories; this song was played daily from the Mark Twain Riverboat at Disneyland, at least during November '09, making it a permanent reminder of Disneyland.
Big Lipped Alligator Moment: The poachers. Sure, their existence is foreshadowed, but they still feel disconnected from the rest of the story and contribute little to nothing to the overall plot. All it boils down to is a few minutes of gratuitous slapstick.
Genius Bonus: When Facilier shows Naveen his future and changes around the image on his cards, three roman numerals appear at the top, IV when it shows Naveen as a royal, XVI shows Naveen in front of a tower, and IX showns Naveen with a bride and her father with treasure around them. In the Tarot, IV is The Emperor, representing power, control, etc. XVI is The Tower, representing a sudden crisis or disaster, and realizations of falsehoods. IX could be The Hermit, representing solitude and contemplation, or given the image could be taken as the Nine of Coins, referring to someone who has achieved fortune through hard work. Lawrence's card meanwhile shows a X, representing the Wheel of a Fortune, a sudden change of luck and fate.
Girls Need Role Models: It's been stressed that Tiana doesn't need a prince and works to achieve her dreams. Anika Noni Rose pointed out how this is a stark contrast to any of the other Disney I Want Songs, in that she knows what she wants, she's "Almost There", and she's done it on her own. Her character is best summed up with her line:
It's funny when you realize that arguably, Princess and the Frog is among the least-girliest Princess movies, alongside Mulan and Pocahontas - it features a very menacing villain, a roadtrip, slapstick, strong leads that aren't romantically interested in eachother at all at first... In comparison, Tangled is a girlier movie, with less peril, less Nightmare Fuel and more "princess"-stuff.
Harsher in Hindsight: In a previous Disney animated feature, The Lion King, Timon once said that the stars in the sky were 'fireflies that were trapped in that big blue-ish, black thing.' Ray, a firefly in this movie, was killed by Dr. Facilier and turned into a star in the sky.
Hilarious in Hindsight: A while ago, some guy named Terry Pratchett wrote a novel called Witches Abroad, whose third act was set in a fusion of the Disney's Magic Kingdom and New Orleans, the plot of which involves voodoo and a prince who's really a frog...
In The Thing (1982), Keith David's character calls out the others for believing in "voodoo bullshit". In this film, he plays a voodoo doctor.
Moe: The film's prologue can be seen as pure unfiltered Disney moe.
Moral Event Horizon: When Facilier crossed the line is uncertain, but it's likely when he offers the souls of all New Orleans to his "Friends" in exchange for their cooperation. He takes it a step further when he steps on Ray the firefly.
MST3K Mantra: Naveen tells a newly transformed Tiana not to think too hard about the fact that she can suddenly understand animals talking.
Narm Charm: It's almost too easy, to the point of cliché, that Ray ends up as a star alongside Evangeline. And yet... it's sweet, and it's fitting, and it works.
During the Ma Belle Evangeline dance, when Ray sings "Look how she lights up the sky", and Naveen looks to Tiana and sees a very cartoony sparkle in her eyes. And yet, it's just too adorable a moment to feel awkward.
Dr. Facilier's issues with his Friends on the Other Side would have made a perfectly good story on its own. Dr. Facilier is basically Disney's version of Dr. Faustus. He had unimaginable demonic power at his fingertips, and all he could think to do was scam a butler and get some money. When his debt is finally called in, he begs for "just a little more time."
Indeed, one of the movie's most prominent criticisms is that the villain was underplayed.
One-Scene Wonder: Mama Odie has about 15 minutes of screen time, but steals the show when she first appears.
Visual Effects of Awesome: The beautiful sequence accompanying "Ma Belle Evangeline". Pond ripples, glowing flowers, Ray's light show...
Win Back The Crowd: This movie was intended to prove traditional animation wasn't dead and re-establish Disney's prominence in the animation industry. While critical and audience response was positive, the jury's still out when you look at the box office take. It opened wide the week before Avatar arrived and steamrolled it; then Sherlock Holmes and Alvin and the Chipmunks: The Squeakquel came along. Financially it's closer to The Emperor's New Groove or Meet the Robinsons than the company's early '90s hits. But since Tiana was long intended as the next official Disney Princess, there's plenty of Tiana and Naveen merchandise already, which will mean plenty more money long after box office sums are counted, not to mention the inevitable DVD sales and rentals.
Although it wasn't quite the smash they hoped for, it did bring attention back to the aforementioned princesses which hadn't seen a newcomer since 1998's Mulan nearly a decade prior. As such, many now call this the sort of starting point for the current Disney Princess Renaissance which has since been running stronger than ever before, especially since there have now been 3 more Princess films formally recognized in relatively rapid succession (one of whom wasn't even technically a Disney Film), not bad after a decent break.
The Woobie: Tiana, especially when she was misled into thinking Prince Naveen was going to marry Charlotte instead of her. Poor Tiana.