The lack of any explanation or science?
At one point, the Dr explains to the pilot a train travelling at 85mph trying to catch up with a train travelling at 85,000mph. I assume he was talking about the speed of their space vehicle vs the speed of expansion of the universe? If so, what was the point and how did they reach the universe edge?
Everything in the film looked deliberately dated (the 1970's style TV show, old TV on a hard drive, buttons, levers, writing on sheets of paper, a pinball machine) but they had 'Earth' gravity and a ship capable of reaching the 'edge of the universe' - despite the train analogy).
I feel like someone saw the end of 2001 and Interstellar and a couple of episodes of Red Dwarf and decided to put them randomly into a film and fill the 100 minutes with s-l-o-w repetitive scenes.