It’s true that the funniest bits in Jesse Eisenberg’s “A Real Pain” turn up in the movie’s trailers.

A lot of over-reactions and under-reactions, infectiously exhuberant changes of mood that can be exhaustingly manic, a big personality overhwelming a reserved one, blasts of setting-inappropriate profanity and a big, well-deserved slap for effect pretty much sum it up.

It’s a funny film, but never actually hilarious. It has its touching scenes, its mild jolts of surprise. And there’s the odd “teachable moment” wrapped in the comical personality clashes about Jewish history in Poland, about family history and taking responsibility for those close to you.

A couple of Jewish cousins — a nebbishy/nervous NYC worrywart and his laid-back-to-manic-in-a-flash “free spirit” country kin (Binghamton, N.Y.)  — fly to Poland to see where their grandmother grew up and fled the Holocaust to ensure they’d be born.

Dave (Eisenberg) is frantic about “schedules” and keeping up with their tour group, whom they constantly inconvenience and insincerely apologize “Sorry, so sorry” to every time they’re late. Benjy (Kieran Culkin) doesn’t sweat deadlines, missed trains or “schedules,” and mails himself some primo weed to their first hotel so that they can chill, rub the rough edges off each day and “feel” together as they take a high-end tour through trauma they will never truly know.

We pick up on unemployed Benjy’s general lack of urgency and his unfiltered, dominate-a-room energy right off. He’s constantly asking “You don’t mind the middle (seat on the airplane),” “Mind if I shower first?” passive aggressions.

He is prone to F-bomb tirades about “the corporatization of travel” and the like, which puts more polite people on their heels.

We take in the ways Dave absorbs this, indulges it, apologizes to the others in their half-dozen-member tour group and their pedantic British guide (Will Sharpe of “White Lotus”) when Benjy goes off on their bougie tour and first class train accomodations when their ancestors eighty years ago “would have been herded (into cattle cars) in the BACK of this f—–g train!”

Dave and Benjy are “types.” Dave’s persona is obvious, and Benjy’s secret pain is as well. But we’re invited to a 90 minute ride-along through Dave’s barely-controlled irritation at Benjy’s hypocritical lectures about “feeling” where they are and what is meant by visiting this cemetery, that “Jewish” gate to Lublin, Poland’s old city and the like. Benjy’s also awfully quick to talk out of turn, to take inappropriate camera poses standing in a Warsaw Uprising monument because they’re “funny,” and just as quick to enlist the rest of their group (Liza Sadovy, Kurt Egyiawan, Daniel Oreskes and Jennifer Grey) in his shenanigans.

Benjy plainly is good at reading people, and relating to them, his fondness for the f-bomb notwithstanding. Dave? He wishes he was more like Benjy even as he’s apologizing for his boorishness.

The sweetness shines through the cringe comedy of “A Real Pain.” The supporting cast is understated and quite good — with Egyiawan playing a soulful Rwandan genocide survivor who picks up on what busy, distracted Dave could get out of being a more “observant” Jew and “Dirty Dancing” alumna Grey dropping Yiddishisms into the chatter as her character shakes off an abrupt divorce by learning about far greater tragedies.

Yes, they visit a concentration camp, its showers and crematoria.

The piano score is the music of Chopin, on the nose but a lilting contrast to the serious and the silly moments unfolding on screen.

And yes, there are acting moments where the distracting “performance” shows through — Culkin leaning far too hard into this or that mood change, occasionally going over the top. One Eisenberg-as-Dave rant has him raising his voice and making the conscious decision to bounce onto his tippytoes while doing it. Cute touch. Never seen that in reality.

And film buffs might recall that there was an earlier version of this sort of pilgrimage, Liev Schreiber’s wonderful 2005 film of Jonathan Safron Foer’s “Everything is Illuminated,” which more amusingly and touchingly sent a put-upon Elijah Wood to Ukraine where the dizzy, evasive locals frustrate him as he tries to track down his grandfather’s old village.

I still prefer that film because of something Benjy complains about in this one. There’s almost “no interaction” with the local Poles, whose place in this piece of Holocaust history is very much a mixed-bag — instances of righteousness almost overwhelmed in compliant, opportunistic anti-Semitism.

The accident of timing is a “this subject is important” benefit to “Pain,” as anti-Semitism has shown its ugly head again, eighty years after the Holocaust. And its a deflating distraction, as Israel carries out what is widely regarded as a genocide in real time in their pursuit of a “One State” solution to their piece of Palestine.

But that’s just more fodder for thought in this cute, edgy travelogue through one family’s private, third generation anguish, and through the “Jewish Experience” of a country that descendants of survivors can joke “kicked us out for being too cheap.”

Rating: R, drug use, profanity

Cast: Jesse Eisenberg, Kieran Culkin, Will Sharpe, Liza Sadovy, Kurt Egyiawan, Daniel Oreskes and Jennifer Grey

Credits: Scripted and directed by Jesse Eisenberg. A Searchlight release.

Running time: 1:30