Yeah there are alot more mistakes than that.
I think the biggest one is near the end with the incoming Death Star and the display on the rebel base showing its distance.
At first, in a fairly long interval of time, the Death Star hardly moves on the display. But ni a shorter, 5 minute interval it moves very far.
Also, when someone on the DS says "rebel base, 30 minutes and counting" the timer shown on screen is counting down from 30
seconds
ahh well, such is life. Every movies got little slipups like that. I imagine most people were too focused on the film's awesomeness to really notice any flaws