She saw the error passed unnoticed. This structure turns "passed" into a modifier describing the state of the object being seen.
See Past vs Passed: Understanding the Advanced Grammar Rules
"See passed" is grammatically incorrect because it combines two verbs improperly. Summary and Application To summarize, "see past" is the correct phrase for looking beyond barriers to understand truth.
You cannot "see" the action of passing; you can only see something and then pass it, or see something that is located in the past. She saw the error passed unnoticed.
See Past vs Passed: Understanding the Advanced Grammar Distinction
Past The confusion between these terms stems from their shared origin, but they function differently in a sentence. When to Use "See Past" You use "see past" when you want to describe looking beyond a superficial layer or an obstacle to perceive the truth.
More About See passed or see past
Looking at See passed or see past from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on See passed or see past can make the topic easier to follow by connecting earlier points with a few simple takeaways.