When Owen and Luke are buying the droids, Luke goes over to an overpass of his aunt, and he looks down. When it shows him from behind, there is no bush on his side, but when it shows a shot from in front of him, there is one (or is it the other way around).

When Luke and Han are in the Falcon inside the Death Star, they lure two troopers up. Han and luke are different sizes, but the stormtroopers were the same size(i mean how tall they are). However, when Han and Luke take their suits, the suits fit Solo and Skywalker perfectly.

During the final battle, it shows a radar screen on the rebel base twice. It shows the planet, the Death Star, and the rebel base. Both times, the Death Star moves a space closer around the planet. But in both shots, it shows the Death Star at the same place (they used the same shot twice in other words). However, the first time, it says 15 minutes left, and the second time, it says five minutes!