TheDerider said:

I did feel there was one place that went a little too far, which was the snowspeeder count. In the clip we see, at least, there's a very clear count of four speeders (save for the "Echo Station Fox Seven" shot), and it further emphasizes the impressiveness of the fight by showing how under-equipped and inventive the Rebellion is. With the additional speeders, whom we do not see during that fight, some of that impressiveness is lost for the sake of one shot. If there are more speeders for the sake of continuity that I'm unaware of, I'm not sure it would really be that many.

There are a lot more than just 4 snowspeeders shown throughout the battle in the official version.

The first shot we see ("Echo station 5-7, we're on our way.) , we see 5 snowspeeders flying alongside Luke, then it cuts to the shot of only 4 speeders, then cuts to 9 speeders flying overhead of the troops in the trenches. Then, when Luke first reaches the walkers we see 3 speeders, with one going to the opposite side of the AT-At then cuts to 4 speeders flying past the walker. So it shows that they have split into groups and in that shot alone there were at least 5 on screen. But if there was only supposed to be 4 speeders throughout the whole battle then there must be killed pilots/ speeders coming back to life:-

First one killed is just before Dak gets killed. We see a speeder shot down behind Luke in the cockpit shot when Luke says "Just hang on. Hang on Dak", so that would leave 3; Luke, Wedge and Red 2, but we know that there is another pilot left at least - Hobbie. Later on , just after R2 is loaded into Luke's X-Wing, we see a speeder going down with heavy smoke trailing it behind the walkers. But we know that all the pilots i mentioned are still alive after this scene, so that means more speeders.