Goofs

Jason Orlean's handbag is seen floating in space during the final credits, but he is holding it in the post-credits scene when he emerges from the rubble.

(at around 1h 35 mins) When Dr. Mindy first sees the comet in the sky, his phone is connected to a car phone holder. When he gets out of the car, he takes out his phone from his pocket and calls Kate, but there is still a phone connected to the car phone holder.

At the public 'Don't Look Up' campaign speech by the president, when it gets rowdy people start throwing bottles at the stage. Jason is hit in the head and there is a visible mark of blood on his temple, yet when he is at the launch site shortly after, there are no marks on his forehead or evidence that he was hit at all.

In the opening, Kate Dibiasky is shown wearing woolen gloves while typing on the keyboard. As she stands to interact with the touchscreen, she shows her bare hands for a moment before going back to wearing the woolen gloves.

(at around 1h 30 mins) When Yule (Timothée Chalamet) and Kate (Jennifer Lawrence) are on the mattress on the roof watching the stars, Yule's arms switch from behind his head, to his sides, to behind his head again.

Astronomers turn off all the lights and screens within the dome when they take images of the sky.

When Kate Dibiasky sees the comet and is on the phone, she says to look at the North Star and Venus, and it is right there. Venus is never near the North Star. Also, it is visible only on the horizon within a few hours of sunrise or sunset.

As they go to be on the RIP, the comet can be seen going past Jupiter. It has a tail, which it shouldn't at this point in its orbit, since it is so far from the sun's heat, which causes the tail to form.

During the first launching sequence, there is a shot of an outdoor wallboard of people watching in Lisbon (flag, city name, and Portuguese TV logos), but the subtitles are in Brazilian Portuguese, and even the translation and wording are incorrect: Onibus=Bus.

At 29:58, the comet is flying over Jupiter, but Jupiter's gravity should have sucked the comet at that distance. That is the reason Jupiter is the bodyguard of Earth.

(at around 1h 28 mins) Right after Yule tries to kiss Kate, some of the film crew and equipment are very briefly visible.

However, director Adam McKay has stated on Twitter that this was done intentionally "to commemorate the strange filming experience" of making the film during the pandemic.

When Dr. Randall Mindy stops his car in the street to look up at the comet and shouts, "There it is!", passers-by also are looking up but in various other directions.

Without Dr. Mindy providing a direction for "where" it is, people will start looking in whatever direction they are facing at the time.

Before Dr. Mindy and Kate walk in for the TV interview, the subway station outside the building changes from 57th Street to 47th in between shots.

Having spent their public lives fully clothed, it's quite unbelievable that the survivors would disembark on their new planet and not notice that everyone is naked.

(at around 3 mins) In the party scene, Dr. Mindy states, "I am so, so thrilled for you, Kate." When the camera pans from the boombox to Leonardo DiCaprio, he is mouthing something else. The audio then becomes correct as he proposes a toast.

At approximately 2 hours 04 minutes, while the main cast is sitting at the table eating dinner, Dr. Oglethorpe is talking about how he prefers store bought to homemade pie. However, the movie cuts to a scene of him taking a bit of the pie while he is still talking to everyone at the table.

When Dr. Mindy first sees the comet, he states that he is in Lansing, MI. A street sign behind him reads "Petronelli Way" which is in Brockton, MA.

As the comet draws closer, long before it becomes visible to the naked eye, it would gradually become visible to amateur astronomers with smaller and smaller telescopes down to hand-held standard binoculars.

In the post-credit scene, Jason Orlean can be seen emerging from the ruins after the impact, talking and taking selfies. However, with the scale of the impact due to the size of the comet, the immediate aftermath would be intense heat from ballistically reentering ejecta. Orlean would have been killed instantly upon contact with the atmosphere.

At the concert, when Dr Mindy and Kate are addressing the crowd, Dr Mindy pronounces nuclear as "nucular", a common mispronunciation, but not one a credible scientist would make.

When President Orlean, and others take off in ships at the end, she offers Randall a place in their escape fleet. It is odd that she thought they had enough time to get Randall despite not knowing where he was, but at the same time, she thought she did not have enough time to get her son Jason when she realized she forgot him, despite him being at the launch site.

Kate states that the comet is twice the size of Chicxulub asteroid that killed the dinosaurs. Chicxulub is 10 km across. It would make it 20 km wide, but the comet is only 9 km wide.

At the concert, Dr Randall mispronounces nuclear as "nucular", an odd mistake for an astrophysicist to make.