The size of a photon is a complex topic, with many experts suggesting that it may not have a meaningful size at all. Instead, the most relevant measure is often considered to be the wavelength of the photon. The discussion also touches on the humorous aspect of spelling errors related to "photon." Additionally, a question was raised about the time it takes for a photon to travel its wavelength, indicating a curiosity about the behavior of light. Overall, the conversation highlights the intricacies of understanding photons in physics.