2. Take care when letting actors improvise. They have a tendency to spell out the story, this is the directors job to keep the actors from being overly obvious.
2.1. Little is often more. The best films were those that used dialogue sparingly or not at all (http://www.youtube.com/watch?v=fDuS24TlCXI). We are making films not radio plays - we have pictures to explain the story not just dialogue.
3. Be careful with comedy. There was one group who made a hilarious film (http://www.youtube.com/watch?v=6SUrjXk2fPM), but it came off very studenty and some people thought it was a little distasteful.
4. (and possibly the most important point to take from this learning curve) Step back from the script. A lot of the films took for granted that the viewer would know the story, this meant they left out important plot devises. For example, one of the films didn't make a point of showing the first 'teleport' in a clear way. For an outside viewer who had not read the script, there's no way they could understood what was supposed to happen - making the rest of the film null and void.
So my point of the year is: to avoid making nonsensical films, make sure you are not too close to the script.
And here it is.