Let's break down the sentence to understand the context and the meaning required for the blank:
- "Even after repeated viewings, the narrative details in Ingmar Bergman's films remain
$\qquad$ "
- The phrase "Even after repeated viewings" suggests that despite multiple examinations, something about the films remains unclear, complex, or open-ended.
- "...never restricted to univocal interpretations."
- This is the most critical clue. "Univocal" means having only one possible meaning or interpretation.
- If the narrative details are "never restricted to univocal interpretations," it logically means they are open to multiple interpretations. Therefore, the blank needs words that mean "having multiple meanings," "open to various interpretations," or "unclear/ambiguous."

Let's analyze the options:
- A. desultory: Lacking a plan, purpose, or enthusiasm; jumping from one thing to another. This describes a scattered or disorganized quality, not necessarily one of multiple interpretations.
- B. disjointed: Lacking a coherent sequence or connection. Similar to "desultory," this suggests a lack of order, not specifically multiple meanings.
- C. multitudinous: Very numerous; existing in great numbers. While details might be numerous, this word doesn't describe their interpretive quality.
- D. unequivocal: Leaving no doubt; unambiguous. This is the opposite of what the blank requires, as the details are not restricted to single interpretations.
- E. polysemous: Having many meanings. This is a direct and excellent fit, perfectly describing something open to multiple interpretations.
- F. ambiguous: Open to more than one interpretation; having a double meaning. This is also an excellent fit, directly conveying the idea of multiple or unclear meanings.

Conclusion:

Both "polysemous" and "ambiguous" perfectly capture the idea that the film's narrative details are not limited to a single meaning and can be interpreted in various ways.

The correct answers are E. polysemous and F. ambiguous.