Memorize scene by scene.
Think about your cues.
Speak out loud, with exaggerated articulation.
your mouth shapes the words,
the sounds are created by your vocal chords and articulators,
and your ears hear them as you speak.
What's "muscle memory"?
Our brains and bodies are constantly looking for easier and easier ways to complete tasks. When we repeat an action over and over, our brain works together with our body to commit the task to memory, so that the next time we need to do it, we can complete it without thinking about it. A lot of the routines in our lives are related to muscle memory.
One day, someone decides that the milk is better off on the bottom shelf instead of in the door.
The next morning, you walk to the fridge to get your milk. Even though you know that the milk is now being kept on the shelf, your muscle memory will most likely still cause you to open the refrigerator door and reach for the milk in the door. To override your muscle memory, you have to really think about where you should be reaching your hand. If you don't think about it as you're doing it, your hand will reach for the door storage.
That's because your brain and body have created a shortcut together, allowing you to pick the milk out of its usual spot in the fridge without applying any conscious brainpower to it.