At approx. minute 62, the six survivors walk across the rim of a small mountain. The Doc is still in the picture even though he died couple minutes earlier. In the next scene he is gone and there are only five people left. The two scenes are even blended so at some point you can see six and five people in one shot.
There are five people in the scene where Captain Lola Beck slaps the cook. In the next shot we see six people walking. And the next shot it's five again. In fact, the last two fade into each other and it's clearly seen that the number of people is different.
Both Sky Marshal Phid and Anoke wear the incorrect epaulets. The epaulets they are wearing are of the Rank of Lieutenant not Sky Marshal. Zander Barcalow, a Lieutenant in the first film, wears the same epaulets.
While Beck, Rico and Dix are talking in the bar, Capt. Beck removes her garrison cap. Thoughout the rest of the scene the hat reappears on top of her head and then disappears when camera angles change. This is at the 13:00 minute mark of the film.
From 21:12 to 21:18, on the far left side of the frame, the knees of a kneeling soldier on a barracks roof instantly materialize over the wall. As the scene pans up, the knees eventually end up in a proper placement. Furthermore, the actor shakes the rifle as if firing, but no muzzle-flash nor audio accompany the action.