‘The Debut’ Review: Julianne Moore, Paul Giamatti in Theater Comedy

When Mona (Julianne Moore) tells a friend she’s auditioned for a production of a show called Nosy Neighbors at their local theater, he admits he’s never liked musicals. They just don’t feel authentic, he explains, the way the characters are always bursting into song. Who does that?

Well, no one, not even in the musical-loving The Debut. But among the first of the film’s sly tricks is that it builds a world in which it feels like people could, where in fact it feels more unnatural that they don’t. Blessed with swing-for-the-fences brio and, in Moore and Paul Giamatti, a leading duo capable of navigating every one of those wild turns, the latest feature by Jesse Eisenberg makes for a frequently hilarious journey into the mind of an overly committed actor — even if, in the end, it seems unsure quite what it wants to say about the self-destructive pursuit of artistic perfection.

At first, Mona would seem an unlikely candidate to go Method in the way of certain prestige actors or comic book movie stars. When we meet her, she’s a meek suburban housewife who’s never acted a day in her life, and whose audition is so mediocre she doesn’t even realize how mediocre it is. Once she lands a relatively minor role anyway, owing to a twist of fate that she may have ever-so-slightly nudged along, she’s just happy to be there, drinking in any suggestion or note or friendly gesture extended to her.

But even from the start, before Mona properly goes off the deep end, The Debut starts inuring us to her heightened perspective. When Mona gets the call saying she’s gotten the part, a spotlight floods her grin and the camera rushes in, as if she might start belting on the spot. On her first day of rehearsal, the whole world is lit a little brighter than it was a few scenes earlier. When she endears herself to her new colleagues with a joke, the laughter feels slightly too enthusiastic. The effect is almost eerie to start, and it takes some getting used to. But it turns out to be just the tip of the iceberg.

The pivot comes when the production’s director, Jerry (Giamatti) — described in a low-key perfect bit of dialogue as “basically the biggest name in New Jersey community theater” — pulls Mona aside for the private special instruction that she (as a truly godawful singer and actress) so desperately needs. Jerry’s usual method is to break his actors down so he can “put Humpty Dumpty together again,” and it begins exactly as planned in an acting exercise that yields one of the very biggest laughs in a film rich with them.

But then Mona takes a little too well to his guidance. As Mona loses herself in her character, a building superintendent named Miss Danielle, her wardrobe, courtesy of costume designer Stacey Battat, goes from prim cardigans to ripped jeans to an actual coverall she’s stolen from a janitor. (This is neither the first nor last time you’ll think to yourself, “Man, theater people are a menace” and “Jesse Eisenberg’s seen some shit, huh?”) She begins frequenting a seedy motel that production designer Anne Ross has cleverly made into a theater actor’s exaggeratedly noirish version of what a seedy motel would look like, with smoke-blurred neon lights and a trash can fire outside and an inexplicably naked man roaming the halls inside.

Most worryingly for Nosy Neighbors — in-universe a well-known musical that’s been around a few decades, in reality an original concocted by Eisenberg and seen here in perfectly cheesy snippets — Mona starts to question Miss Danielle’s motivations, then her lines, then her actions. Jerry realizes he’s created his own worst nightmare: the sort of difficult actor who thinks she knows her character better than the director or even the script that invented her.

Lively throughout, The Debut ascends to new heights whenever Giamatti and Moore share the screen together. Moore is an absolute hoot as Mona, who starts out looking on paper like one of those disaffected housewives she’s played so often (and so expertly) in her career but turns out to be much, much stranger. Giamatti makes Jerry ferocious but not monstruous, a man who certainly likes barking orders at various underlings but loves making good theater even more. Their scenes opposite each other are not just entertaining but thrillingly dynamic, as the balance of power between them begins to shift.

It’s all so much fun that it’s easy not to notice at first that none of this is headed anywhere particularly profound. There’s a touch of poignancy in the understanding that Mona is so eager to lose herself in Miss Danielle because — like Rita, the protagonist of Telluride 2026’s other “New Jersey suburbanite abandons her family to pursue a more authentic life under the guidance of a charismatic but demanding leader” premiere — she barely knows who she is in the first place.

But the film never builds out the rest of Mona’s world, like her inattentive husband (Patrick Fabian), or even co-stars like Steph (a very endearing Halle Bailey) and Todd (Eisenberg, adorably giving himself an excuse to sing and dance), to take that line of thinking anywhere truly insightful or emotional.

Among the arguments between Mona and Jerry are what theater can or should be. Mona argues that that the stories it tell should be “real,” even at the expense of a happy ending, while Jerry argues that no one cares much about the plot — audiences just want to feel while spying on the intimate lives of other people.

The Debut, in prioritizing style, humor and outrageous plot turns over complex emotionality, would seem to side with Jerry. Maybe it’s not everything it could be. But as I howled over the lengths Mona would go to for the sake of what Jerry unkindly but accurately points out is, in the end, just some “thankless tertiary character,” it felt like more than enough.