During production you need to rehearse, working out blocking (where actors will stand and how they will move). Do not over-rehearse, especially with younger actors. The director should communicate his or her vision for each scene clearly to everyone on the cast and crew.
The lighting should be intentionally placed. Make sure your audio is clean and understandable.
Advice to actors: the camera is your audience; remember shots are assembled; be willing to “go deep” inside yourself to create the desired emotion so that it will come through in the shot. Bring yourself into the role and feel what the character should be feeling in the part. Be in control of yourself and purposeful in how you play a part. Each scene should end with a hook like a chapter of a book.
Advice to crew: Treat the camera like it’s a member of the audience that you’re showing around the set; allowing them to see exactly what you want them to see. Basic coverage includes filming a master shot and individual close-ups of each actor, along with any required inserts to tell the story (Jason J. Tomaric, Behind the Screen - Director’s Craft, 2015). This is deliberate film-making that raises it to an art.
View your clips each day with your crew and place them in their own folder, separating those you want to use (number and name them) from those you don't (place them in a "trash" folder that you may want to scrounge through and recycle clips from on occasion).