The writers behind Spider-Man: No Way Home say that they "have answers" for some of the plot holes created by the ending, but that they're not allowed to discuss it yet.
The ending of Spider-Man: No Way Home sees Peter Parker letting Dr Strange cast a spell that means the whole world will forget he exists, only remembering who Spider-Man is. This ending acts as a reset button for Holland's Spider-Man, but it drew some criticism as it didn't explain what happened to physical items that proved Peter Parker was Spider-Man, or just pictures of Peter Parker himself.
As reported by IGN, No Way Home co-writers Erik Sommers and Chris McKenna talked about the plot holes that the ending creates and revealed that they have answers for all of it, but decided to go with a more emotional ending rather than one that tries to explain everything.
McKenna said, "We talked about that a lot and we can't divulge much, but just know we talked about it a lot and there were conversations about it. And I will say answering those questions by the end of the movie, felt like it would be almost too much to have to explain that, in this movie. So I would hope that it's one of those details that I feel like would've been a bridge too far for us to have to explain in this movie. But we have thoughts and answers."
In response, Sommers said, "We deliberated a lot. Is it going to be like a Back to the Future kind of thing? Or are people going to be disappearing from photos? Are physical objects going to be disappearing? All these things. And like Chris said, ultimately, we decided that it would take so much time and real estate in the movie to explain all of that. It would just detract from the emotion of it."
To end the discussion, McKenna said, ""Believe me, we have answers to it," reiterated McKenna, "but I don't think we're... We're not allowed to divulge that. But we have answers."