When Rey wants to hear the real truth from Luke of what has happened to Kylo and him you can see the rain pouring down. But when Rey leaves Luke's planet one shot later, it is not raining anymore and Luke and his clothes have become dry in just a few seconds.
In the opening sequence the bombers are going to throw bombs on enemy ship. Since they are in space this won't work. Bombs don't fall down in space. They would need some kind of fire device to fire them down.
At the beginning of the film during the bombing sequence, a character is seen inside her ship with the doors open to allow the bombs to be dropped out of the ship. She does not have any kind of oxygen mask or supply, despite this sequence being set in space. However, all through the Star Wars universe, there are openings into space that do not affect a ships atmosphere. We see this in a New Hope in the Death Star hangar bays and in The Force Awakens when Po and Finn steal the TIE Fighter. A thin magnetic shield is employed which allows solid matter, but not gas to pass through it.
During the slow-mo chase, the rebel lost 2 or 3 support ships that ran out of fuel. It is established that the fuel for sub-light engines vs light-speed engines is separate. So why didn't they send all the support ships at the star destroyers at light speed to destroy them. The last person on board was going to die anyhow. Or why didn't the last capital ship head to the same planet to cover the shuttle retreat, there by lending cover to the shuttles?
A major plot point is made of the fact that the First Order can track Resistance ships while they are in hyperspace, without the aid of a tracking beacon. This is treated as a new occurrence, but it completely ignores what was established in Rogue One: A Star Wars Story. In Rogue One, Tantive IV jumps into hyperspace, leaving Darth Vader behind. Vader then presumably returned to his star destroyer before resuming the chase. Since Vader ambushed Tantive IV over Tatooine in Star Wars: A New Hope, it is clear that he tracked the ship through hyperspace.
The goof items below may give away important plot points.
The second time they are meeting in the red room of Supreme Leader Snoke, you can see two black clothed, kind of technicians in the background. Altough we always saw the door and they did not leave, they suddenly disappeared.
Finn and Rose crash right in front of the battering ram cannon, which is shown to be heavily guarded. The enemy forces are under a "no prisoners" order. How were the heroes able to traverse the great distance back the mine's entrance without being attacked?