You only remember the ones where the plot goes totally off the rails, dialogue makes no sense, and acting is just bizarre. Whoever is writing this trash is chronically incapable of producing anything even remotely good. It’s either forgettably mediocre or experimental chaos and pure madness.
Dream memory is the same memory as any other types of memory, and you can learn to memorize your dreams by paying attention to them and, for example writing the down.
But because there is no major outcome from this, very few does that. But it is a fun experience to go through.