- Why do they still depict the heroes as kids whenever there's a time jump? For example, Neil Armstrong apparently landed on the moon as a preschooler.
- The Secret Museum's technology is so sophisticated, it may alter the children's perceptions to help them relate to the historical figures they meet, by making their adult selves appear child-sized. This might also explain why so many of the male historical figures are depicted with facial hair even in their boyhood, and account for incongruities of clothing like Armstrong wearing his space suit decades before the suit was manufactured: the Museum makes their child-selves resemble whatever photos or paintings the trio have seen of those figures as adults.
Headscratchers / Xavier Riddle and the Secret Museum