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Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Fight Club (1999), you can actually see Tyler Durden (aka, Brad Pitt) in a few frames before we ever meet him. I understand this is a nod to how Tyler did something similar during his job as a projectionist. But my question is, how did David Fincher film those momentary appearances? Was it all editing? I am interested to know how he actually filmed these sequences and positioned Brad Pitt accordingly.
Output:
How did David Fincher splice Brad Pitt into multiple frames?