There are a few possibilities:
* The title is incorrect. Double-check the spelling and year. Perhaps there's a slight error in the title or the year.
* It's a short film or a lesser-known film. If it's not a mainstream movie, finding information about it might be difficult.
* It's a book, not a film. "Memoirs of an Imaginary Childhood" could be the title of a book.
If you can provide more context about the movie (e.g., the director, genre, any other details you remember), it might help me locate it.