Goofs

When Jakub is about to collect samples, command tells him to "start the collection in T minus 10" as if that were a period of time. Historically it is however a point in time, with "T" marking the exact moment the event will take place.

This jargon misinterpretation is actually present in almost every 'realistic' space travel movie using the phrase.

No space agency would send just 1 person on such a vital, prolonged interplanetary mission. It would have been at least a crew of 2 people minimum, and likely more, in case someone becomes dysfunctional or incapacitated. (All lunar missions, for example, consisted of a crew of 3 people.)

Approximately 20 minutes into the film, the Jakub character locks himself in a separate air lock, floats his body down into a space suit, and orders a fumigation / decontamination of his entire ship and living quarters. The top-down entry into this suit has an exposed tubular opening, and also, Adam Sandler's character never scrubs his skin down or sprays himself with any kind of germ killing spray, before entering the suit. This is hence not a thorough process.

It takes about 35 minutes for radio waves to travel between Earth and Jupiter, so any radio/TV conversations would have a 70-minute delay between the transmission of a single message and its reply.

In the movie Jakub uses the CzechConnect. This uses quantum entanglement for faster than light communication. Although at this moment theoretical, it's not proven as impossible by science.

The Jakub astronaut character is often getting exercise walking on a treadmill. Unless there are harness ropes pulling the human working out down tightly towards the contraption, and/or the loop or sheet of walking surface offers resistance and must be pushed back with force, then the exercise session is futile, and the person working out is merely arcing and swinging their legs back and forth like a pendulum in anti-gravity, and not truly getting walking exercise.