I quite enjoyed the new DnD movie but one thing stuck out to me that I just couldn't get over. The fabulous breakout character Doric the Tiefling Druid has a cool sequence near the beginning where she wild shapes over and over again to lead the bad guys on a merry chase. Normally a druid gets two wild shapes per short rest (this is usually plenty). Yes she also shifts into an Owlbear and that's a monstrosity not a beast but that's not important what does everything in a movie have to follow the game rules? I'm trying to talk about Doric's finite number of wild shapes here, stay on topic. Then it occurred to me there is a very interesting in game explanation for why she might be able to do that:

A lvl 20 druid gets Archdruid: You can use Wild Shape an unlimited number of times. Obviously Doric appears to be a teenager but Tieflings are described as living a little longer than humans and she only has to make it to lvl 18 to get Timeless Body whereupon she starts aging at 1/10th the normal rate. It would explain why she's shown living with the wood elves who show her mad respect, as would be appropriate for an Archdruid, and they'd be the ideal place to conceal her timeless nature.

This then begs the question of WHY she is slumming it with a failed Harper trying to pull a heist, and furthermore would appear to be hiding the full extent of her powers as thoroughly as possible. Fortunately the answer is right there: to quietly derail the plans of the Red Wizards, which would definitely have been bad for the forest, without marking herself or the wood elves as a target. Obviously this is just silly head canon stuff but I love the idea that the bumbling PCs had the local Archdruid quietly along for the ride tipping the balance and never knew it :D

The protagonists are all about 8th or 9th level, they just didn't hold hard to the rules.  Notice she can wildshape a lot, but she doesn't really cast spells.

They were just playing a bit loose with the rules in order to make the scenes look cool on screen, hence the Owlbear. Don't read too much into it.

Aren't their stats posted someplace on DDB?

NPC stat block gives her five wild shapes a day

https://www.dndbeyond.com/monsters/3342708-doric

She doesn't even obey those rules in the film, either. During the chase out of the castle, she becomes a:

1. She starts of as a flying insect.
2. Shen transforms into a mouse.
3. After a brief period as a human, she becomes a mouse again.
4. She becomes a bird.
5. She becomes a cat.
6. She becomes an axebeak.
7. She becomes a deer.

That's 6 wildshapes (7 if you count the two mice wildshapes individually).

Define a short rest ;)

She's secretly an Archfey. They get bored. They like to mess with the minds of mortals to alleviate boredom. 

Or she's like Elminster and has been made immortal. 

In the film she's a character. If you use her in your game she's an NPC.

And she just decided that since her Wildshape ability lasts for around four hours, and doesn't specifically state she has to stay in only one shape, she can use one charge and keep shapeshifting the entire time. 

Seven wildshapes? I knew it! Her character sheet is just part of the ruse... srsly of all factions to avoid angering, a bunch of undying liches is at the top of the list. She's very wise to use a false identity.

I liked this scene so much in the movie that in my next campaign I'm houseruling it into the game, with some extra wording that essentially says your hit points can never go up due to a new form and that turning back to human ends that use of WS. I don't think it breaks anything and I think my players will have a lot of fun with it.

Really, the rules should state that out of combat - or any shape that's basically useless in a fight - you can just go wild (haha) and shapeshift to your hearts content. 

Quote from scatterbraind >>

I liked this scene so much in the movie that in my next campaign I'm houseruling it into the game, with some extra wording that essentially says your hit points can never go up due to a new form and that turning back to human ends that use of WS. I don't think it breaks anything and I think my players will have a lot of fun with it.

 As in, your first WS works as RAW, but then afterwards you could change form and still have it count as your first WS unless you go back to being human? That could be pretty cool. I think the odd bit is the HP, though. If you became a Hawk then a Brown Bear, you'll have a Brown Bear with 1-3 HP. Personally, I'd retain damage - if you take damage, it carries over until you become human, which ends that session of WS.

Can you convince my DM please

Quote from scatterbraind >>

I liked this scene so much in the movie that in my next campaign I'm houseruling it into the game, with some extra wording that essentially says your hit points can never go up due to a new form and that turning back to human ends that use of WS. I don't think it breaks anything and I think my players will have a lot of fun with it.

 Can you convince my DM please

That scene has my character feeling like a turtle aspiring to be a speed bump. 

She’s clearly trading spell slots for more wild shapes. I’ve known Druid player who never want to cast spells, they just wanna be Beast Boy.