Both "Hold the door for me" and "keep the door open for me" (if said in the same context) convey exactly the same information. Neither is better than the other and native speakers will use both.
My own opinion is that films and television series in English are excellent tools that aid in the learning process. They fulfill a number of needs, but do not supply everything you will need to know to become fluent.
Also, when watching and listening, try not to use subtitles. I know it's difficult, but even if you feel totally lost, your mind is still absorbing many things. Hearing English and how it flows is important in developing pronunciation skills later on.
Best of luck,
Student or Learner